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單項(xiàng)選擇題

Aboard a survival craft,ether can be used to（）.

A.start the engine in cold weather
B.aid in helping personnel breathe
C.prime the sprinkler system
D.prime the air supply

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單項(xiàng)選擇題

Above-normal tides near the center of a hurricane maybe caused by the（）.

A.high barometric presure
B.jet stream
C.storm surge
D.torrential rains

單項(xiàng)選擇題

According to the customs of this port, the work of opening and closing hatch covers is done by（）.

A.the ship's officers
B.the foreman from the shore
C.the ship's hands
D.the tally man

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