Given the same water depth and line tension，the holding power of a 19 pound/foot wire rope mooring system in comparison to the holding power of a 90 pound/foot chain mooring system will be（）.

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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Generally，what is used to inflate liferafts?（）

A.non-toxic gas
B.Oxygen
C.Hydrogen
D.Helium

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