判断题

对抗肌多数情况下是原动肌工作时的一种阻碍。
正确
错误

答案：错误

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单项选择题

PID控制器的传递函数形式是（）。

A.5+3s
B.5+3/s
C.5+3s+3/s
D.5+1/(s+1)

单项选择题

3) The electric potential at x = 3.00 m is 120 V, and the electric potential at x=5.00 m is 190 V. What is the x component of the electric field in this region, assuming the field is uniform (in N/C)?

A．140
B．-140
C．35
D．-35
E．75