单项选择题

A lifeline must be connected to the liferaft （）.

A.at the bow
B.at the stern
C.in the middle
D.all around

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单项选择题

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

单项选择题

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

单项选择题

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