东风7C型机车制动时,闸瓦不会向外移出踏面,是因为没有横向力。
参考答案:错
东风7C型机车制动时,闸瓦不会向外移出踏面,是因为没有横向力。
参考答案:错
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From Monday 1 Friday, American students usually get up at seven. Then they wash their faces and 2 . | |||
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