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

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Science and technology small production pole woodpecker science experiment package 7-14 years old primary school students friction physics experiment toy

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Maxwell rolling pendulum stem technology small production diy physical experiment gravity model popular science equipment wholesale

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Science and Technology small production diy electric sliding aircraft children's science experiment teaching aids student handmade stem device material

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

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100ml magic water sprite solution magic water baby special pigment handmade ocean baby supplement

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Student Experiment Professional Microscope Scientific Experiment HD Optical XSP-02 Professional Teaching Children Microscope

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Industrial clutch brake friction plate

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

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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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Xueyouma Portable Microscope Upgrade 3-in -1 Set Dual Light Source Experiment Microscopic Slide Specimen Toy

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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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Creative Technology small production friction experiment brain Tiangong Primary School kindergarten science popularization experiment toy teaching aids

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

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

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Science Experiment Solar Fan Children's Handmade Equipment Material Package Science and Technology Small Making Small Invention Science and Education Frontier

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Friction electrification scientific experiment diy technology small production electrostatic demonstration material package steam Classroom Manual

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

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