When would you ground an electric hand tool?（）<br>A:When it is a DC machine<br>B:When it is an AC machine<br>C:Any machine that operates on over 100 volts<br>D:Only when working on wet steel plates

When would you ground an electric hand tool?（）
A:When it is a DC machine
B:When it is an AC machine
C:Any machine that operates on over 100 volts
D:Only when working on wet steel plates

出自：海船船员证

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