你可以用称冬瓜来证明。把冬瓜放磅秤上称一次。再用小绳将冬瓜蒂稍稍提起,再称一次。两次称重肯定不同。
你可以用称冬瓜来证明。把冬瓜放磅秤上称一次。再用小绳将冬瓜蒂稍稍提起,再称一次。两次称重肯定不同。
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