单选题When would you ground an electric hand tool?（）AWhen it is a DC machineBWhen it is an AC machineCAny machine that operates on over 100 voltsDOnly when working on wet steel plates
单选题
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
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