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【单选题】
系统开环传递函数为两个“s”多项式之比G(s)=M(s)/N(s),则闭环特征方程为()。A.
N(s)=0
B.
N(s)+M(s)=0
C.
1+N(s)=0
D.
与是否为单位反馈系统有关
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反馈参考答案：
举一反三
【单选题】Over the past three years, the amount of money spent on home computers has risen by 55%, far___ income growth.
A.
in a bind of
B.
in a manner of
C.
in excess of
D.
in a position to
【单选题】of the money been spent recycling the rubbish. [ ]
A.
Three fourths, has
B.
Three fourths, have
C.
Three fourth, has
D.
Three fourth, have
【单选题】of the money used up.
A.
Three-five, are
B.
Three-fifths, have been
C.
Three-fifths, has been
D.
Third-fifths, is
【单选题】In order to earn more money for his new car, the young man has to work for three ______ hours in the evening. [ ]
A.
extra
B.
many
C.
else
D.
another
【单选题】成绩表中有“总评成绩”、“平时成绩”和“期末考试”等字段,其中,总评成绩=平时成绩+0.6×期末考试。则进行表设计时,“总评成绩”的数据类型应该是
A.
计算
B.
整数
C.
文本
D.
数字
【单选题】_____ earn more money for his new car, the young man has to work for three _____ hours in the evening. [ ]
A.
In order to, extra
B.
In order that, many
C.
In order that, else
D.
In order to, another
【单选题】____of the money____ nm out.
A.
Three-fifth; has
B.
Three-fifth; has been
C.
Three-fifths; has
D.
Three-fifths; have
【单选题】_______of the money_______been spent recycling the rubbish.
A.
three fourths; has
B.
three fourths; have
C.
three fourth; has
D.
three fourth; have
【简答题】A．He makes a lot of money. B．He has just been left some money. C．He doesn't believe three hundred dollars is enough. D．He can't afford to spend that much.
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