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A kind of geographical teaching solar lunar eclipse apparatus for demonstrating
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A kind of mathematical probabilities teaching sieve agitating device
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A kind of musical instrument education auxiliary device
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A kind of portable tableware packet
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A kind of portable educational instructional device
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A kind of map for geography teaching suspension arrangement
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A kind of Multi-functional rotary insulating tableware
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A kind of children teaching toy
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A kind of interim storage bin of biology sample
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A kind of biochemical experimental provision of safe and convenient
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A kind of tamper-proof gun with biological identification device
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