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【判断题】
一阶系统在单位阶跃响应下,调节时间按指数曲线衰减到初值的5%求，有ts=3T。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】6. Parvin is going
to visit her relatives in Iran (next, in) year.
【多选题】老子认为水有这两个最显著的特性和作用:一是( ); 二是( )
A.
滋润万物而不与任何事物相争。
B.
甘于处在最卑下的地方。
C.
水是大自然对人类的恩赐，是一种用之不完，取之不尽的资源。
【单选题】Lucy called everyone and told them she ______ have the party. [ ]
A.
isn't going to
B.
wasn't going to
C.
won't
【单选题】James with the Greens Gele Mountain if it tomorrow. [ ]
A.
are going to ; isn't rainy
B.
are going to ; doesn't rain
C.
is going to ; won't rain
D.
is going to ; doesn't rain
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