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單項(xiàng)選擇題

An example of a messenger is a（）.

A.fairlead
B.heaving line
C.stay
D.warp

單項(xiàng)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 personnel from operating them