整流型阻抗继电器分为整流型全阻抗继电器、整流型方向阻抗继电器、（）阻抗继电器等。
A.触发特性
B.比较特性
C.偏移特性
D.脉冲特性
参考答案：C
— What do you think of Peter?
— He ______ be really difficult to get along with even thoughhe's a nice person in general.[ ]
A. shall
B. should
C. must
D. can
浮地接法容易产生（）干扰。
