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?（）
单项选择题 Which may ignite fuel vapors?（）
单项选择题 Where would you find the call sign or call letters of the radio station on your ship?（）
