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【单选题】
非单位负反馈系统,其前向通道传递函数为G(S),反馈通道传递函数为H(S),当输入信号为R(S),则从输入端定义的误差E(S)为 ( )A.
、()()()E S R S G S =⋅;
B.
、()()()()E S R S G S H S =⋅⋅;
C.
、()()()()E S R S G S H S =⋅-;
D.
()()()()
E.
S R S G S H S =-。
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A.
push it out immediately
B.
push it again within 30 seconds
C.
push it again within 1 minute
D.
de-energy SSAS immediately
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A.
Pushed
B.
To push
C.
Push
D.
By pushing
【简答题】( )的结果是设计和编写相关课程的重要资料来源。
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