题目内容

系统的数学模型有哪些?

A. 微分
B. 传递函数
C. 信号流程图
D. 方框图

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________no bus, we had to walk home.

A. There is
B. There being
C. As there being
D. There be

________, the text became easier for us to learn.

A. New words explained
B. New words being explained
C. New words are explained
D. New words was being explained

Father came back, _______ a bag of money on his left shoulder.

A. he carried
B. he carrying
C. carrying
D. and carrying

为什么微分方程要进行拉氏变化?

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