单项选择题

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

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

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单项选择题
Generally，what is used to inflate liferafts?（）

A.non-toxic gas
B.Oxygen
C.Hydrogen
D.Helium
单项选择题
Generally speaking，you should expect to find low atmospheric pressure prevailing in the earth’s（）.

A.equatorial area
B.polar regions
C.mid-latitudes
D.All of the above
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