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[Star River] cable-stayed bridge diy technology small production mechanics physics experiment school education training material package

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Science and Technology Small Production DIY Creative Teaching Science Experiment Student Small Invention Electric Jeep Off-road Vehicle Material Package

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Pupil Experimental Pigment 10ml Children's Science Experimental Color Hand Tone Slime Pigment DIY Material

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10ml children science experiment pigment water soluble pigment Plasticine slime diy handmade soap colorant

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3# lithium grease extreme pressure composite lithium grease universal lithium butter industrial lithium grease

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Learning Youma Eight Planet Learning Instrument Solar System Model Primary School Students Milky Way Electric Three-Ball Instrument Astronomical Teaching Aids

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800g keg general grease excavator loader butter construction machinery friction parts lubrication anti-rust

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diy kindergarten Elementary School students' science and education toys scientific small production friction generation electric electrostatic experiment handmade materials

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Electromagnetic brake friction plate motor brake disc brake pad Mechanical accessories

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Friction starting science experimental materials science and technology small production children's stem maker education and training equipment

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Science and technology small production DIY colorful full-color light circuit experimental toys electromagnetic induction science small experimental material package

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Air pressure disc brake friction plate for printing machine paper cutter industrial machinery air pressure disc brake pad

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diy technology small production homemade air pressure rocket scientific experiment air gun principle model material

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Frictional electrification science experiment diy technology small production electrostatic demonstration material package steam classroom manual

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Scientific Experiment diy Friction Electrogeneration Material Package Electrostatic Demonstration Technology Small Production Student Children Handmade

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Wholesale White Special Grease Mechanical Bearings Reduce Friction High Temperature Lubricant Metal Curing Lubrication

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Electronic cannon DIY homemade technology small production handmade gun science and technology experiment science and education air pressure launch stem

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Scientific experiment diy climbing monkey physical friction technology small production student children handmade school material package

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Fruit power generation experiment set scientific experiment materials student science and technology training class teaching tools hand-made

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Scientific small production diy rocket launcher model students physics experiment enlightenment learning teaching aids

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Science and technology small production diy material package small invention hand-made dehydrator dryer elementary school students scientific experiment

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Air pressure disc DBS DBK brake friction plate multi-point round RE old paper cutter brake pad

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Science and technology DIY balance scale small production primary school children science experiment handmade lesson puzzle stem educational supplies

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5G 10 waterproof sealed silicone grease faucet toy water gun cylinder O-ring silicone grease paste small package lubricating grease

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