All electrical appliances aboard a vessel should be grounded to（）.<br>A:prevent them from falling when the vessel rolls<br>B:protect personnel from electrical shock<br>C:increase their operating efficiency<br>D:prevent unauthorized personnel from operating them

All electrical appliances aboard a vessel should be grounded to（）.
A:prevent them from falling when the vessel rolls
B:protect personnel from electrical shock
C:increase their operating efficiency
D:prevent unauthorized personnel from operating them

出自：海船船员证

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