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

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4800 times HD children primary and secondary school students scientific experiment optical microscope educational toys suit wholesale

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

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Children's kindergarten Elementary School students physics science experiment small production small invention electrostatic friction electric electrostatic experiment

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

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Science and technology small production suspension blowing ball electric science experiment DIY teaching aids Primary School students manual work material package

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