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【单选题】
闭环控制系统又称为( )控制系统A.
开环控制系统
B.
前馈控制系统
C.
反馈控制系统
D.
复合控制系统
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反馈参考答案：
举一反三
【简答题】______ we were tired after the journey, we were in good spirits.
【简答题】阅读理解。 After we finished thir miles of hiking, we were tired and our muscles ached as we made our way back to New England. The car ride to the airport followed by a two-hour flight left our legs mo...
【简答题】We were tired after________(walk) for about eight hours .
【简答题】After we finished thir miles of hiking, we were tired and our muscles ached as we made our way back to New England. The car ride to the airport followed by a two-hour flight left our legs more wor...
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