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2017 年 12 月 28 日の正誤問題。返信は 0 点から 6 点で採点されます(投稿から 1 日経ってからの返信は得点されません。ご返信ありがとうございます。)

2017-12-29View Original

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摩擦は、一部の部分では機器にとって有益ですが、他の部分では有害です。(通常および真空装置) 回答: はい
Reply #22017-12-30
摩擦は、一部の部分では機器にとって有益ですが、他の部分では有害です。(V)

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