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【单选题】
若某系统的根轨迹有两个起点位于原点,则说明该系统 。
A.
含两个理想微分环节
B.
含两个积分环节
C.
位置误差系数为零
D.
速度误差系数为零
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举一反三
【单选题】图中乐器的名称是_________.
A.
古琴
B.
古筝
C.
扬琴
【单选题】图中乐器的名称是________.
A.
胡琴
B.
三弦
C.
扬琴
【判断题】Eveline was not respected at the shop she worked, nor was she at home, though she was a hard-working girl.()
A.
正确
B.
错误
【简答题】What did she do when she stared at the screen?A. She had to tell her colleague the data. B. She had to prepare some reports . C. She had morning tea and a quick look at the newspaper. D. She talked wi...
【单选题】She bought the same skirt at a lower price at the same shop where I bought mine because she was a __________ customer.
A.
common
B.
regular
C.
normal
D.
usual
【简答题】A.She stayed at the opening the entire time. B.She wasn't able to attend the show. C.She lost interest in the show and left. D.She wasn't familiar with the artists.
【简答题】A.She is at school. B.She is at the library. C.She is at tile swimming pool. D.She is at home.
【单选题】图中乐器的名称是________.
A.
二胡
B.
高胡
C.
京胡
【简答题】A.She suggests the man should not look at the job advertisements. B.She suggests nothing. C.She suggests the man should look at the job advertisements. D.She means that the job advertisements are of n...
【单选题】图中乐器的名称是________.
A.
葫芦丝
B.
唢呐
C.
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