单项选择题

One of the first actions to be taken by survivors when they have boarded an inflatable liferaft is to（）.

A.stream the sea anchor
B.take an anti-seasickness pill
C.open the pressure relief valve
D.drink at least one can of water

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单项选择题
Normal pool elevation is the height in feet of the section of river above a dam. This height is measured from（）.

A.low steel on the Huey P. Long Bridge
B.mean sea level
C.the local water table
D.the minimum dam control level
单项选择题
Most drill ships and barges have a walled opening below the derrick，open to the water’s surface and through which various drilling tools can pass down to the sea floor called a （）.

A.moon pool
B.spider deck opening
C.pontoon
D.keyway
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