单项选择题
Which method is used to detect rot in manila lines?（）
A.Feeling the surface of the line for broken fibers
B.Measuring the reduction in circumference of the line
C.Observing for the appearance of mildew on the outer surface
D.Opening the strands and examining the inner fibers
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Which measure should NOT be taken to reduce the pounding of a vessel in a head sea?（）
A.Add ballast in the afterpeak
B.Add ballast forward
C.Alter course
D.Reduce speed -
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Which may ignite fuel vapors?（）
A.Static electricity
B.An open and running motor
C.Loose wiring
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Where would you find the call sign or call letters of the radio station on your ship?（）
A.In the rig safety manual
B.On the Certificate of Inspection
C.On the Ship Station License
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