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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

单项选择题

In （） the control action is independent on(of) the output.

A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear control system

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