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【单选题】
伺服系统是一个三闭环控制系统,其中速度控制是( )。A.
外环
B.
内环
C.
中环
D.
不确定
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举一反三
【单选题】— Can I smoke here? — No, _____ at no time in the library. [ ]
A.
smoking permits
B.
smoking does permit
C.
smoking is permitted
D.
is smoking permitted
【单选题】--- Why can’t I smoke? --- At no time ____ in the meeting room.
A.
does smoking permit
B.
is smoking permitted
C.
smoking is permitted
D.
permits smoking
【简答题】期货交易中的贵金属包括（ ）。
【单选题】Smoking does great harm to our health. ( ) is smoking allowed in public places.
A.
In no time
B.
At a time
C.
At all times
D.
At no time
【单选题】—Can I smoke here?—No, at no time in the library.A．permits smokingB．does smoking permitC．smoking i
A.
—Can I smoke here? —No, at no time____in the library. A．permits smoking
B.
does smoking permit
C.
smoking is permitted
D.
is smoking permitted
【单选题】Smoking does great harm to our health. ( ) is smoking allowed in public places.
A.
In no time
B.
At a time
C.
At all times
D.
At no time
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