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【单选题】
采用负反馈形式连接后，则A.
一定能使闭环系统稳定
B.
系统动态性能一定会提高
C.
一定能使干扰引起的误差逐渐减小，最后完全消除
D.
需要调整系统的结构参数，改善系统性能
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反馈参考答案：
举一反三
【简答题】What does a shopper need to do if he or she has a specific shopping plan?
【单选题】Mrs Smith ____ her keys in the office, so she had to wait until her husband ____ home. [ ]
A.
has left; comes
B.
left; had come
C.
had left; would come
D.
had left; came
【单选题】If she __________ that he was coming, she would have prepared the guest room.
A.
knew
B.
has knew
C.
has known
D.
knows
【简答题】A．He is not that far away if she wants to visit. B．He doesn't believe that she will really miss him. C．He welcomes her phone calls any time. D．He will telephone her as often as he can.
【单选题】天真善良的吉尔塔,在公爵的心中,打下了深刻的烙印,可当他,再次来到那个院落的时候,少女已经,不知所踪,这让公爵,嗅到了一丝,不祥的味道。公爵听闻,吉尔塔被人诱拐,伤心不已,唱起了咏叹调( )。
A.
《如果有爱人该多好》
B.
《帕，帕，帕，帕帕盖娜》
C.
《帕，帕，帕，帕帕基诺》
D.
《泪洒千行》
【单选题】If she sees clothes that he likes, she _______________to buy them immediately.
A.
is inclined
B.
inclined
C.
apt to
D.
is given to
【简答题】You are sick. please make a short dialog.
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