單項(xiàng)選擇題

Generally, what is used to inflate life rafts?（）.

A.Non-toxic gas
B.oxygen
C.Hydrogen
D.Helium

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單項(xiàng)選擇題

Generally, when lifting an inflatable life raft back aboard ship you would use the（）.

A.towing bridle
B.main weather cover
C.external lifelines
D.righting strap

單項(xiàng)選擇題

Get the searchlight（）for transiting the cancal at night.

A.turned off
B.already
C.almost
D.ready