有一单容控制对象其放大系数K小,这说明该控制对象()
A.对扰动敏感
B.对扰动不敏感
C.惯性大
D.惯性小
参考答案:B
一段导体两端的电压是6V时,通过导体的电流是200mA,若使该导体两端电压变为3V,则该导体的电阻为______Ω.
It's extremely dangerous for the drivers to _____ speed as the traffic lights are changing. [ ]
A. pull up
B. put up
C. rise up
D. pick up