关于方向舵的说法,错误的是:().A.A.配平有反馈B.当两个FAC都失效时,行程限制器将转为全行程C.有机械备份操作D.三个液压作动筒同时

关于方向舵的说法,错误的是:().A.A.配平有反馈B.当两个FAC都失效时,行程限制器将转为全行程C.有机械备份操作D.三个液压作动筒同时工作

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新诗《小河》的作者是()。A.周作人B.胡适C.刘半农D.郭沫若

新诗《小河》的作者是()。A.周作人B.胡适C.刘半农D.郭沫若

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He said that he had left his umbrella in the library.

He said that he had left his umbrella in the library.

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He is always very active in student activities.

He is always very active in student activities.

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