电容器（）联后，总电容是各电容之和。
A、并
B、串
C、混
D、不确定
参考答案：A
—Did you wash your clothes?
—No, I was going to wash my clothes but I ______ visitors. [ ]
A. have had
B. have
C. had
D. will have
CRT显示器主要由场（）、（）、（）、（）、（）等组成。
