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【单选题】
已知单位反馈系统的开环传递函数为 ,当输入信号是 时,系统的稳态误差为( )。A.
0
B.
10
C.
20
D.
∞
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反馈参考答案：
举一反三
【单选题】What is authority that flows up and down the chain of command called?
A.
staff authority
B.
departmental authority
C.
delegated authority
D.
divisional authority
E.
line authority
【简答题】若随机变量 ，且 ，则 __________．
【单选题】What authority sent this mayday relay?
A.
By OCEAN KING
B.
By port authority
C.
By VTS
D.
By rescue centre
【单选题】What authority is based on special expertise and usually involves counseling and advising?
A.
line authority
B.
matrix authority
C.
delegated authority
D.
staff authority
E.
divisional authority
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