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CN108109483A
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A kind of equipotential surface demonstrator in noninertial system
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CN108062891A
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Slingshot effect demonstration instrument
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CN108288424A
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Space ship is by planet speedup demonstrator
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CN108154768A
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A kind of centrifugal force analytical demonstrator
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CN108182853A
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Freely glide the equipotential surface demonstration device in being
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CN107731058A
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Projection and view device
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A kind of evaluation method of many judging panel's average ratings
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CN107122336A
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A kind of evaluation method for many judging panel's average ratings for laying particular emphasis on sequence
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CN104842688A
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Reading pen
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CN104840137A
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Paper extraction box
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CN104840047A
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Electric blanket
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CN102987608A
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Gloves
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