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單項(xiàng)選擇題

A life float on a fishing vessel must be equipped with （）.

A.a painter
B.red smoke flares
C.a jackknife
D.a signal mirror

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單項(xiàng)選擇題

A life preserver or buoyant work vest is required to be worn on a ship when a person is （）.

A.working on the rig floor
B.working over water
C.working on the pipe racks
D.operating line throwing equipment

單項(xiàng)選擇題

A latitude line will be obtained by observing a body （）.

A.on the prime vertical
B.on the celestial horizon
C.at lower transit
D.on the Greenwich meridian