The switchboards are those in which all the live parts are installed behind the panels and only the operating handles and instruments are on the front（）<br>A:open<br>B:open front type<br>C:live front type<br>D:dead front type

The switchboards are those in which all the live parts are installed behind the panels and only the operating handles and instruments are on the front（）
A:open
B:open front type
C:live front type
D:dead front type

出自：海船船员证

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