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【单选题】
下面说法正确的是:A.
传递函数这种数学模型适用于非线性系统和系统。
B.
只有满足零初始条件的系统传递函数。
C.
传递函数是零初始条件下线性定常系统的输出量的拉氏变换与输入量的拉氏变换之比。
D.
由输出信号的拉氏变换除以输入信号的拉氏变换，就可以得到线性定常系统的传递函数。
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举一反三
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A.
attention
B.
focus
C.
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D.
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would to
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focus
D.
award
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survived
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【简答题】判断一个字符ch是数字的表达式是 [填空(1)]A. ch>='1'&&ch<='9'< /div>
【单选题】Sally contributed a lot to the project, but she never once accepted all the______for herself.
A.
credit
B.
attention
C.
focus
D.
award
【单选题】Sally contributed a lot to the project, but she never once accepted all the_________
A.
[A]credit
B.
[B]attention
C.
[C]focus
D.
[D]award
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