A.DacronB.NylonC.EsterleneD.PolypropyleneWhich mooring ……

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

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

单项选择题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

单项选择题Which may ignite fuel vapors?（）

A.Static electricity
B.An open and running motor
C.Loose wiring
D.All of the above

单项选择题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
D.On the rig Watch Bill