单项选择题

A petroleum liquid has a flash point of 85°F. This is a grade （）.

A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid

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单项选择题

A.should always be immediately corrected
B.will always cause a vessel to capsize
C.always results from off-center weights
D.All of the above are correct

单项选择题

A navigator fixing a vessel’s position by radar （）.

A.can use radar information from one object to fix the position
B.should never use radar bearings
C.should only use radar bearings when the range exceeds the distance to the horizon
D.must use information from targets forward of the beam

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A natural fiber rope can be ruined by dampness because it may （）.

A.rot
B.shrink
C.stretch
D.unlay