输出电磁滤波器安装在变频器和（）之间。抑制变频器输出侧的谐波（）。
参考答案：电机；电压
Don't expect too much of him. After all, he is a child of ____ intelligence. [ ]
A. average
B. slight
C. strange
D. different
与产生抑制性突触后电位相关的主要离子是（）
A．Na+
B．K+
C．H+
D．Ca2+
E．Cl-
