你可以用稱冬瓜來證明。把冬瓜放磅秤上稱一次。再用小繩將冬瓜蒂稍稍提起,再稱一次。兩次稱重肯定不同。
你可以用稱冬瓜來證明。把冬瓜放磅秤上稱一次。再用小繩將冬瓜蒂稍稍提起,再稱一次。兩次稱重肯定不同。
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