题目内容

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

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A. 1
B. 2
C. 3
D. 4

A. GRANT GRADE ON SC TO ZHAO
B. GRANT UPDATE ON SC TO ZHAO
C. GRANT UPDATE (GRADE) ON SC TO ZHAO
D. GRANT UPDATE ON SC (GRADE) TO ZHAO

A. 正确
B. 错误