电气控制原理图分为（）两部分。

A.主电路、辅助电路

B.控制电路、保护电路

C.控制电路、信号电路

D.信号电路、保护电路

A．He drank too much coffee last night.

B．He caught a cold last night.

C．He is nervous about his project.

D．He missed dinner last night.