软开关电源工作方式的电路中，一般可分为（）几类；
A、零电压电路
B、零电流电路
C、零电压/电流共存电路
参考答案：A, B
— It is said that Jack is very rich and is always changing his private cars. What is he?
— ________, I am not sure. [ ]
A. Somebody of a manager
B. Something of a manager
C. Anyone of a manager
D. Anything of a manager
导致儿童梦游症的原因是什么？应该如何进行矫治？
