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【单选题】
在自动控制系统研究中经常采用( )作为输入信号
A.
斜坡函数
B.
脉冲函数
C.
阶跃函数
D.
抛物线函数
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【简答题】The exhibition of the European Single Market aims to foster and extend the sp______ of European friendship.
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【单选题】关于爆炸品生产厂房、储存库房和销毁场地的平面布置，下列说法错误的是( )。
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