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【单选题】
单位负反馈系统的开环传递函数为Gk=(2s+3)2/[s(s+1)2(s+5)]，则其对数幅频特性曲线处在的斜率为()A.
-60dB/dec
B.
-80dB/dec
C.
-40dB/dec
D.
-20dB/dec
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反馈参考答案：
举一反三
【单选题】A company had 30 direct production employees at the beginning of last year and 20 direct production employees at the end of the year. During the year, a total of 15 direct production employees had lef...
A.
16.7%
B.
20.0%
C.
25.0%
D.
60.0%
【简答题】straight adv.
【单选题】Great importance has been ________ education since 1985, when the first educational reform began. [ ]
A.
attached to
B.
devoted to
C.
linked to
D.
used to
【单选题】As welfare reform. has____millions of single mothers like Patino into the workforce since 1996, questions about its effects on families have loomed large.
A.
nudged
B.
propelled
C.
divested
D.
bumped
【单选题】A great deal of advanced science and technology has been ______ since China carried out the reform and opening policy.
A.
brought down
B.
brought in
C.
brought out
D.
brought up
【简答题】粒子速率 v=______× 10 8 m/s 时,粒子的动能等于它的静止能量。 ( 保留两位小数 )
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