單項選擇題

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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單項選擇題

All entries in logbook,（）made,must not be erased or amended.

A.once
B.whether
C.previous
D.just

單項選擇題

All entries in the official logbook must be signed by the master and（）.

A.the union representative
B.the person aboat whom the entry concerns
C.no one else
D.one other crew member