单项选择题
Insulation light is located on.（） of main switchboard.
A.Paralleling panel B.Load panel C.Emergency generator control pane D.Main generator control pane
单项选择题 Synchrocope and synchro light are located on （） of main switchboard.
单项选择题 To （） , the power is supplied by main switchboard directly not though sub-board.
单项选择题 （）is not installed on the main switchboard.
