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【单选题】
闭环控制系统又称为（ ）控制系统A.
开环
B.
前馈
C.
反馈
D.
复合
手机使用
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微信扫一扫
反馈参考答案：
举一反三
【单选题】A lot of people have tried, but ______ have succeeded.
A.
many
B.
much
C.
a few
D.
few
【单选题】A lot of people have tried, but _____ have succeeded.
A.
many
B.
some
C.
few
D.
a few
【单选题】听力原文： Colds have always been a nuisance, and people have tried many strange ways to cure them, However, none have worked. one Roman historian even recommended kissing the nose of a hairy mouse (29) ! ...
A.
Keeping warm and dry.
B.
Drinking a lot of liquid.
C.
Living close to the hospital.
D.
Kissing the nose of an animal.
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