Specifications Bar grating 1,ISO9001&14001 2,Opening:30x100mm;40X100mm 3,Bar:25X3mm 4,Material:gal steel/stainless steel Bar grating Bar grating1,ISO9001&14001 2,Opening:30x100mm;40X100mm 3,Bar:25X3mm 4,Material:gal steel/stainless steel Standard type: 1m×6m(special sizes or American standard sizes available). Material: Carbon Steel. Surface Treatment: Hot-dipped Galvanized or black. Appearance of Surface: Plain or Serrated. Bar grating is widely used in the platform, corridor, bridge, well covers, stairs, fencing for petroleum, chemical, power plant, waste treatment plant, civil engineering projects and environmental projects. specifications of the Bar grating SeriesPitch of Bearing barCross-bar PitchSpecification of bearing bar load(width×thickness)20×325×332×340×320×525×5 1 30100G203/30/100G253/30/100G323/30/
Place of Origin: China (Mainland) Brand Name: MASTECH Model Number: MS6700 Specifications 1)30-130dB,3 1/2 digitals 2)Sample:2 times/s 3)Frequency:30Hz~8KHz 4)analog bar indicator MS6700-30-130dB Digital Sound Level Meter wholesale&retail,free shipping
Place of Origin: Guangdong China (Mainland) Brand Name: bothlighting Model Number: LE022 Light source: 18 x 3W Ultra bright 3-in-1, TRI Color RGB LEDs 4 operation modes: DMX-512, Master/Slave, Stand Alone and Sound Active,can add wireless Beam angle: 40 degrees Power Draw: 70W Type: LED wall washer Packaging & Delivery Packaging Detail: carton box with PE foam Delivery Detail: 7 days after payment Specifications American dj LED wall washer 18x3W 1.18pcs 3W RGB 3in1 leds 2.Guarantee: 1 year 3.High power ,high brightness led mega bar Product name: American dj LED TRI COLOR BAR 18x3W , LED wall washer , dj lightsSpecification: Power70wPower supplyAC90V-250V/50-60HzBeam angle40 degreesLight sources18 x 3W Ultra bright 3-in-1, TRI Color RGB LEDsDMX channels2, 3, 4, 6, 7, 12 & 54 channel modesModeDMX-512, Master/Slave, Stand Alone and Sound Active, can add wirelessLamp life6-10 ten thousandElectronic Dimming0 - 100%Protection ratingIP20Body colorblackColor16.7mil
Place of Origin: Guangdong China (Mainland) Brand Name: Topstriving Model Number: LED AETHER 4 Voltage: AC 90-240V 50/60HZ LEDs: 256 5mm high MCD LEDs(24*4 Red,24*4 Green,16*4 Blue) Life(hrs): 100,000 Beam Angle: 15° Housing: black housing Operational Modes: DMX 512 protocol, Sound Active, Auto DMX Channels: 5 Input/Output: 3-pin XLR cable Dimensions: 938*170*100mm Weight: 5.0kgs Packaging & Delivery Packaging Detail: carton packing Delivery Detail: 3~30 days according to quantity Specifications 1.256*5mm professional lighting dmx stage tri led bar 2. LED AETHER 4 3. 5 dmx channels 4.15 degree beam angle 5.CE and ROHS Specification: 1. Electronic power supply AC 90-240V 50/60HZ 2. color strobe effect and long life operation 3. black housing with 256 5mm high MCD LEDs (24*4 Red,24*4 Green,16*4 Blue LEDs) 4. low heat,Long Life LEDs (100,000 hrs.)5. op
Specifications 1)More than 10 years experience 2)EN71/ASTM/6P/OEM service 3)Good quality&Competitive price 4)Good Service&Fast shipping Top Hot Flashing Double Head Space Bar, glow stick Item No.DW004317DescriptionSpace barPackagePolly bagQty/carton144 pcsMeasurement99*41.5*94cmVolume13.63 cuft/0.386 cbmG.W./N.W.18.5/16kgsThis toys is beatiful and funny,could bring much fun for children. OUR FACTORY: FAIRS: CERTIFICATE: NEW ITEMS: Welcome to contact us. Welcome to visit our company. We do hope that we can establish a long-time and steady relationship and try our best to support your business. Our Trade Manager ID: cnmyj Thank you very much for visiting!
Specifications Multi-effect stage laser lighting 1party, bar, disco lighting. 2 Red and green laser projector. 3 one year warranty mini multi-effect stage lighting Description:
Place of Origin: Guangdong China (Mainland) Brand Name: Beilarly Model Number: BCS-151X two-way passive loudspeaker: coaxial structure for vocal sound reinforcement: 1*15" LF,1.75"HF Packaging & Delivery Packaging Detail: 1.EPE inner wrap 2.corrugated carton 3.outside wooden shelf to strengthen(if required) Delivery Detail: 15 days after receipt of deposit Specifications 15" two-way passive loudspeaker BCS151X for large bars 1.1*15" LF,1.75"HF 2 coaxial structure 3 for vocal sound reinforceme 15" two-way passive loudspeaker BCS151X for large bars features:BCS-151X is a two way passive frequency loudspeaker, low frequency/high frequency contains a specially customized 12" cone bass driver loaded in a specially designed cabinets with the box by BMS audio. The part of high frequency contains a 1.75-inch compression driver, together with low-frequency speaker in a coaxial structure, providing an open cone waveguide. BCS-151X is mainly used for vocal
Place of Origin: Guangdong China (Mainland) Brand Name: bothlighting Model Number: LE022 Light source: 18 x 3W Ultra bright 3-in-1, TRI Color RGB LEDs 4 operation modes: DMX-512, Master/Slave, Stand Alone and Sound Active Beam angle: 40 degrees Power Draw: 70W Type: LED wall washer Packaging & Delivery Packaging Detail: carton box with PE foam Delivery Detail: 7 days after payment Specifications American dj LED TRI COLOR BAR 18x3W 1.18pcs 3W RGB 3in1 leds 2.Guarantee: 1 year 3.High power ,high brightness led mega bar Product name: American dj LED TRI COLOR BAR 18x3W Specification:18 x 3W Ultra bright 3-in-1, TRI Color RGB LEDs (60,000 hour rated) 3-in-1 TRI Color RGB LED provides optimal color mixing with no RGB shadows (offers a seemingly unlimited color palette) 4 operation modes (DMX-512, Master/Slave, Stand Alone and Sound Active) 7 DMX work modes (2, 3, 4, 6, 7, 12 & 54 channel modes) Strobe Function can be added to any color combination Flicker-free operation for film
Specifications ceiling bar length:3000mm,3600mm,3660mm thickness:0.2-0.4mm ceiling bar1) Ceiling T-Bar/ keel;2) Together with PVC gypsum ceiling, Mineral fiber ceiling, gypsum ceiling, calcium silicate ceiling;3) Used to make ceiling for office, shop and other spaces.Specification:1) Main Tee:Size:24*38*3000/ 3600mm/3660mm,24*32*3000mm/3600mm/3660mm2) Middle Cross Tee:Size:24*25*1200/1220mm,24*26 *1200/1220mm3) Small cross TeeSize:24*25*600/610mm,24*26*600/610mm4) Wall angle: 20*20*3000mm/3600mm/3660mm,22*22*3000mm/3600mm/3660mm5) Thickness: 0.23-0.40mm.Special sizes and thicknesses can also be produced as per your requirements
Place of Origin: Guangdong China (Mainland) Brand Name: Charming Model Number: COL.L.AEC064 Light source: SMD 5050 RGB 3 in 1 Number of leds: 60 pcs Power: 20W Dimension: D30*L800mm Protection level: IP42 Working voltage: DC5V Material: Fire retardant PC Lifespan: >50,000 hours Net weight: 0.6kg/pcs Control mode: DMX512 / SD Card Control / LED Flash Computer Control Packaging & Delivery Packaging Detail: 80pcs led tubesfor 1 carton, volume:L1050*W700*H660mm, Weight:42Kg Delivery Detail: 5-7 working days Specifications 1. SMD 5050 RGB 3 in 1 2. 3D effects 3. Match with Madrix, light to music and sound 4. Can display flash with music bite 2013 newest led falling star lights for bar & disco decoration SMD 5050 Product features 1. Adopted SMD LED as light source 2. Creative shape design, ceiling mounted. It showed 3D lighting effect. 3. Computer control system for flash
Specifications sound buzzer for samsung i9100 1.original 2.delieve time:1-3days 3.test one by one 4.warranty:12m Wholesale S2 samll parts sound buzzer for samsung i9100 from China alibaba 1.Perfect service2.the quality is original3.guarantee time:12 months4.fast deliever. About us Guangzhou Soonwint Electronic Co. Ltd is established in Guangzhou Electric city,China in 2010.Our company sells flex cable,lcd,touch screen and phone housing of all kinds of cell-phones. LCD ,touch screen,flex cable,housing for nokia LCD ,touch screen,flex cable,housing for iphone LCD ,touch screen,flex cable,housing for blackberry LCD ,touch screen,flex cable,housing for HTC LCD ,touch screen,flex cable,housing for samsung LCD ,touch screen,flex cable,housing for sony ericsson LCD ,touch screen,flex cabl
Brand Name: Lowin Model Number: LKS-501 Channels: 2.1 Player Type: DVD Player Special Feature: Wireless System Place of Origin: Guangdong China (Mainland) Packaging & Delivery Packaging Detail: Soundbar Size:1017x126x66mm Subwoofer Size:268x333x268mm 20gp container:800sets 40hq container:2100sets Delivery Detail: 35 days Specifications 2.1 Soundbar with USB/SD, 3D Speaker. Sound bar home theater sound system. Soundbar speaker OEM with CE DVD soundbar speaker 2.1 sound bar /soundbar home theater sound system/soundbar speaker with FM/USB/SD/RCA/Bluetooth/SRS/wireless subwoofer. Specification: Power Supply AC~220V/50Hz Power Consume 75W Power RMS Front L/R.CENTER.REAL/R 15w*2=30W(1K) SRS 15W*5=75W SUB-W 40W(100Hz) L/R UNIT IMPEDANCE 6Ohm WOFFER UNIT IMPEDANCE: 4OhmS/N≥60dB BASS TUNING(100Hz)±14dBTREBLE TUNING(10KHz)±14dBSTEREO UNBALANCE≤2dB STEREO CROSSTALK≥60dB FREQUENCY RESPONSE(L/R CH.) 250Hz-20K
Specifications Android robot mini speaker 1.Built-in rechargeable lithium battery 2.Support TF card,cell phone,computer 3.Colorful LED USB android robot mini speaker for ipad notebook Main Features *Accompanying speaker for PC.MP3, MP4 and notebook*Support mp3 file*Mellow and clear timbre*Built-in active amplifier*Pure and elegant sound quality with unsurpassed effect*In compliance with acoustics and aestetics rationale*Flexible sound with distinct tone levels*Small sized design, easy to take*Support TF card*FM radio Accessories:1)3.5mm stereo audio cable 2)USB cable 3)Menu book
Place of Origin: Guangdong China (Mainland) Brand Name: aier Model Number: AD-N-series use: ktv,hotel,bar.stage type: active size: single and double colour: according to your request Special Feature: With rotate colorful laser light channel: 2.0 packing: carton with foam material: pvc speaeker: new model/style function: with 7 band EQ Packaging & Delivery Packaging Detail: hardly cartons with foam Delivery Detail: 30 days after got deposit Specifications 1.Built-in 7.5Ah battery 2.Integrated retractable handle and wheels for easy carrying 3.Convenient for outdoor & indoor acti 2013 New style wholesale High performance sound 12" PA system full iron net high quality audio active speaker Features: 1.This portable Public Address System can be used either indoors or outdoors at any demanding venue.2.Integrated retractable handle and wheels for easy carring.3.with USB /SD card reader Jack, can read and play song. 4.Music volume control and mi
Specifications Portable blue tooth amplifier Hands free function Remote control Sensing touch buttons Original appearance design L.HOME kaidaer mini speaker bluetooth sound bar distributors wanted industrial products *Bluetooth, FM, Hands free, Remote Control.*Unique capacitive sensing touch buttons.*Built-in microphone noise reduction circuit and hands free function.*Built-in double lithium battery charging and discharging protection to alarm when the battery power is low.*AUX (line in): 3.5mm audio input, Mini USB charging jack.* Polymer lithium battery is replaceable (battery model : BL-5C). Product Show Main FeaturesBluetooth versionVER2.1+EDRQualit
Brand Name: kinma/oem Model Number: IA-6120USB Channels: 5.1 Player Type: Sound bar Place of Origin: Guangdong China (Mainland) color: black Packaging & Delivery Packaging Detail: Product size: 940(L)x170(W)x165(H)mm Packing Size:995(L)x215(W)x220(H)mm Loading quantity : 20'(28m3):600sets; 40'(58m3) : 1200sets; 40'HQ(68m3):1400sets Delivery Detail: 40days Specifications CE& ROHS 5.1Ch Sound Bar Video: with 480 dpi & 720 dpi TV output with USB/SD Card Welcome to visit our store! we have 11 years history,with high quality .technology leadership,customer first ,excellent service,we have established business relationship in more than 50 countries and regions,including east europe,south america,south-east asia,south africa,australia,etc,besides marketing under the brand of KINMA ,we also do OEM and ODM for some international famous brands. Pls attention : we always provide the best version with you. we have strong after -sale service center.a
Light Source: LED Item Type: Light Strips Place of Origin: Guangdong China (Mainland) Brand Name: V-Photron Model Number: VPT-LN003S07W Energy Savings: 80% luminous flux: 80-100lm Work Current: 600mA Packaging & Delivery Packaging Detail: 5m/roll Delivery Detail: 5-10Working Days Specifications 1. hight quality led lighting bar 2. CE and Rohs approved LED Light Bar 3. led lighting bar Specifications:3528/5050 SMD Structure: Specifications:[Length]: 0.1M,0.2M,0.5M,1M[Flux]: 80-100lLM[Voltage]: DC12V[Drive]: constant voltage drive[LED Angle]: 120 degrees[Lifespan Life]: 50,000 hours[Maximum cascading]: 5M[Fixation]: 0.1M[Color]: red, yellow, blue, green, white, full-color variety of light colorsFEATURES 1,LED Light Bar with Good Quality,Independent developing electrical, efficiency higher than 95%2,LED Light Bar: High quality, good light color with competitive price and delivery on time3,out of every three LED can be cut along any of the above tangent, without dama
Type: Laser Lights Input Voltage(V): AC110V/220V Working Temperature(℃): 15 - 35 Working Lifetime(Hour): 5000 Certification: CE,FDA,RoHS Emitting Color: Red Place of Origin: Guangdong China (Mainland) Brand Name: X-Laser Model Number: X-RGB 706 Packaging & Delivery Packaging Detail: Packed with Color Box, Flight Case or do as your requirement Delivery Detail: 3-5days Specifications 1.laser Power: R:635nm150mW G:532nm100mW B:450nm250mW 2.Play Mode: Auto,sound active,DMX512,Master/slave,SD Card,key switch 500mW RGB full color Animation laser with SD+2D/3D Change Change For Party,Clubs, Pubs Bars Features: The best-matched colour and power,and laser power with dual temperature control, great effects will give you amazing visual impact.Application of places: disco, dJ, bars, nightclubs, public squares and various large venues 1. Model: 300mW RGB full color Animation laser light with SD+2D/3D Change ( X-RGB 70
Products Status: Stock Brand Name: Keythai Model Number: CNP Lens Place of Origin: Shanghai China (Mainland) Packaging & Delivery Packaging Detail: CTN or Plastic Bag or meet your request Delivery Detail: within 15 days Specifications 1.Material: PolyCarbonate(PC) 2.Accept Customized Sample 3.Technology: Printing+Stamping 4.Surface: Matte 5.Best Quality 1. Material & Technology:(1)Material: PolyCarbonate(PC)(2)Technology: Silkscreen Printing, Stamping, etc. 2. Details Show: 3. General Products about Our Products: MaterialNickel(Ni), Aluminum(AL), Stainless Steel(SUS), Poly Carbonate(PC), Acrylic(PMMA), etc. Size1.Gauge:1)Ni: 0.05mm, after brushing coating, it’s 0.1mm +/- 0.03mm 2)PC: 0.075mm ~ 1.5mm 3)AL: 0.3mm ~ 0.8mm 4)SUS: 0.1 ~ 0.3mm 5)PMMA: 0.3mm ~ 2.0mm 2.Length & Width: Customization TechnologiesBrushing/Hairline, Sand Blasting, Lithographic Printing, Silk Screen Printing, Stamping, Anodizing, Etching, NC, Laser En
Place of Origin: Guangdong China (Mainland) Brand Name: Vientiane Model Number: WX-EF034 Voltage: AC220V, 50Hz Light Source: 61pcs*5mm LED Power Consumption: 15W Signal Control: DMX512 Operational Mode: sound control mode, auto-running mode, master-slave mode Control Channel: 6CH Synchronour Motor: AC220V/20RPM*2 Working Environment: -10-35 degree Size: 330*180*175mm Weight: 2KG Packaging & Delivery Packaging Detail: Carton with foam Flightcase as your required Delivery Detail: 1-3days for sample,7-15days for one container Specifications led stage bar scan light 1.Specification: Mode:WX-EF034 Name:LED SCAN ROLLER LIGHTVoltage :AC220V, 50Hz Power Consumption :15wSignal Control :DMX512 Operational Mode :sound control mode, auto-running mode, master-slave mode Control Channel :6CH Synchronour Motor AC220V/20RPM*2 Working Environment I Working Environment Size: 330*180*175mm Net Weight 2kg
Specifications Type U aluminum ceiling 1)light and consistency 2)rich colors 3)sound blocking ,fire resistance 4)easy fix and install Type U aluminum ceiling1Descriptions of Type U aluminum ceiling1)Alloy: 1100 1060 30032)Thickness: 0.8-2.0mm or custom make3)Size: tailor-made4)Surface coating: fluorocarbon coating.2Certificates: CE and ISO: 9001-20003Packaging:protection film ,wooden case, according to your requirement.4Delivery date: 20-30 days after deposit5Product characteristic: 1) Flexible suspension system makes each ceiling tile easily installed and disconnected 2) Easy to match lamps or other ceiling parts 3) Surface color can be stable for 10 years by indoor use 4) Noodle plate beautiful, generous and elegant, high precision, 5) Easy to match lamps or other ceiling parts 6Recommend applying in these places: Supermarket ,Air port ,Bus station ,School ,Office ,Corridor and toilet
Brand Name: BSPH Model Number: TZ-806/809/812/815 Type: Passive Use: Portable Audio Player,Outdoor,Hotel, Park, Gym, Bar, School,etc Channels: 3 (2.1) Special Feature: Mini Place of Origin: Guangdong China (Mainland) Packaging & Delivery Packaging Detail: Standard Export Packing Delivery Detail: 10~30 after confirm order Specifications Public Address Column Speaker Easy installation Good sound reinforcement Subwoofer Speaker, Powerful Outdoor Column Loudspeaker(TZ-806/809/812/815) 1.A high quality and luxurious all weather outdoor power speaker series of BSPH PA system.It has steel body, metal grille, streamline surface and special light green coat which makes it be elegant and easy to match with the ambinet environment. There are four types of rated output power 60W,90W,120W,150W 2.Built-in 1,2,3,4 woofers separately and 1 tweeter, suiltable for music and speech broadcasting. With steel body and black metal grille, it's very easy to be installed with iron mounting
Specifications mobile docking station: 1.aluminum housing 2.led flash light 3.built-in li battery 4.card reader Specification mobile docking station: TEOTI Recommends Enjoying the music on your iPhone or iPod anywhere-from bedroom to den to dorm. Latest generation Boom boxes for iPod/iPhone chargeable Docking station mini speaker Portable mini speaker for iphone cellphone/mp3/ipod/CD 1.For iphone ,MP3,MP4, mini speaker, HI-FI speaker, portable speaker. 2.Anywhere can enjoy music. 3.Small cool shape, Trendy personalized with LED display. 4.Unique design philosophy- telescopic extension speaker. 5.support SD/MMC card support, USB flash support,FM radio,LED display,Time & alarm, USB&nbs
Specifications -Fashion -Bluetooth handset -Lessen radiation -Re-charging function -CE,REACH,ROHS, Active digital bluetooth sound bar for iphone
Specifications TP-868 LED BAR 1.2 DMX modes: 7 channels / 12 channels 2.RGB Color Mixing 3.DMX, Auto, Sound Activation LED BAR FEATURES+ RGB color mixing + DMX, Auto, Sound Activation+ 2 DMX modes: 7 channels / 12 channels+ 24 Built-in automated programs via master/slave + Variable electronic dimmer 0-100%+ Strobe: 1-20 flash/second+ LED digital display+ Beam angle: 20° + Light Source: 252 ( R108/G72/B72) LEDs, Φ10+ LEDs life: 100,000hrs+ Power consumption: 35W+ Power: AC 110 - 230V + Size: 1000mm x 65mm x 85mm + Weight: 3kgs Order Details:1) Payment Terms:T/T in advance(30%deposit before production, 70%balance before shipment)2)Lead Time: 3-5working days for sample, 5-7working days for mass production after you confirmed your sample3)Warrenty: one year Warrenty 4)Packaging: packed by cartons or according to your requirments Warmly welcome Your Enquiry!!! Contact Details:Web:www.pro-toplight.comMsn:toplight2005.com.cnSkype:toplight2005
Specifications galvanized steel bar grating specification 1,ISO9001&14001 2,Opening:30x100mm;40X100mm 3,Bar:25X3mm 4,gal steel/s.steel galvanized steel bar grating specification Bar grating1,ISO9001&14001 2,Opening:30x100mm;40X100mm 3,Bar:25X3mm 4,Material:gal steel/stainless steel Standard type: 1m×6m(special sizes or American standard sizes available). Material: Carbon Steel. Surface Treatment: Hot-dipped Galvanized or black. Appearance of Surface: Plain or Serrated. Bar grating is widely used in the platform, corridor, bridge, well covers, stairs, fencing for petroleum, chemical, power plant, waste treatment plant, civil engineering projects and environmental projects. specifications of the Bar grating SeriesPitch of Bearing barCross-bar PitchSpecification of bearing bar load(width×thickness)20×325×332×340×320×525×5 1&n
Specifications colored knob /plastic knob/potentiometer knob Item no.:1001Material:ABS /PP+TPR Shaft hole:6.4mm with set-screw PART NO.:1001(16*14H) rubber knob potentiometer knob Item no.:1001(16*14H)Material: ABS /PP+TPR Shaft hole:6.4mm/6*18T/6*4.5mm Detailed picture: Product characteristic :Knob it is an edge with one or a series of label of the common circular protrusion, disc or dial,can be rotated or push pull, to start and to manipulate or control something. (such as radio or television).It has plastic knob, baklite knob, aluminium knob,metal knob etc.Application scope:This series products mainly Suit for Consumer Electronics,Medical Devices,Mechanical components,Electrical equipment and products etc. Mechanical parameter: Brand:TYXNItem no.:1001(16x14H)Size:Dia:16mmx14HmmMaterial:ABS /PP+TPRShaft hole 1:6.4mm with set-screwShaft hole 2:6mm with set-screwShaft hole 3:6mmX18TeethCertificate:ROHS certificateColor:Many color could customizedFunc
Specifications 1.pro loudspeaker audio products 2.1x15", 500w/8ohm 3.Usage:Band, stadium,Church, theaters,concert hall,Disco bar,club Model: PS-15 Bass Pro loudspeaker audio products Frequency Response[a]40Hz-300Hz+3DbSensitivity 1W@1m[b]96dB SPL Nominal.99dB SPL WidebandRated power550W AES,1100W peakNominal Peak SRL@1m[b]129 to 132dB Peak(for 550 to 1100W RMS Amp.)Nominal Impedance8ΩComponentsLF1×15″(38cm)6ΩdriverConstructionBaltic Birch Plywood finished with textured,polyurethane black coatingFittingsHandles 2,integral to cabinetFront finishAcoustic foam on perforated steel grille(77% transparent)Flying Points1×steel anchor point for flying track on top(9 positions)2×steel anchor plates for flying track on bottom(3 positions)Connectors3×NL4MP 4-pole SPEAKON;Passive Loop Thru,Active InDimension675×434×457mm(26.63″×17.13″×18″)Net Weight28kgGross Weight32kg
Material: ABS Technique: Polished Style: Artificial Use: education toys Theme: Music Regional Feature: China Place of Origin: Guangdong China (Mainland) Brand Name: shengyip Model Number: talking book color: any color voice: can be customized Packaging & Delivery Packaging Detail: opp+carton, Delivery Detail: 30-60 days Specifications 1,making learning more interesting 2,press button,here the sound. 3.oem design music sound book for children education Talking chip module for book 1. An excellent children book keeps your kid interested while learning. 2. This sound story book is printed in attractive colors, ensuring quality vision stimulation for young kids. 3. Buttons corresponding with the pictures enhance the effectiveness of learning. 4.&nbs