单项选择题
（）is not a part of the main switchboard.
A.Busbar B.Load panel of main generator C.Paralleling panel D.Shore connection box
单项选择题 （）is not a part of the main switch board.
单项选择题 （）are supplied by main switchboard directly.
单项选择题 After resolving the trouble of main power supply, main switch of emergency generator should（）, if power supply is refreshed.
