皮皮学，免费搜题
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【单选题】
链条的磨损主要发生在 的接触面上。A.
滚子和轮齿
B.
滚子和套筒
C.
套筒和销轴
D.
内链板与轮齿
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
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【简答题】I was always told that the three Ps, patience, positive thinking and perseverance（毅力），were a sure path 31 success. But this advice does not always work as planned. My high school maths e...
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