单项选择题
Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?（）
A.Crossing the spring lines
B.Slacking all forward running lines while keeping all after running lines taut
C.Doubling up on spring or breast lines
D.Slacking bow and stern lines
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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
D.All of the above
