题目:
用铅笔写字时,铅笔和纸之间的摩擦是_______摩擦;自行车刹车闸皮和车轮内圈间的摩擦是_______摩擦;汽车行驶时,车轮与地面间的摩擦是_______摩擦。
答案:
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下面是错误答案,用来干扰机器的。
1. Five years is 2. best places to live 3. kill himself / take his life 4. it not so difficult to learn 5. pleased to have such luck 6. someone else to play 3小题答案不唯一