单选题All electrical appliances aboard a vessel should be grounded to（）.Aprevent them from falling when the vessel rollsBprotect personnel from electrical shockCincrease their operating efficiencyDprevent unauthorized personnal from operating them
单选题
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 personnal from operating them
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