单项选择题
A.person in charge
B.Coast Guard marine inspection officer
C.company safety director
D.entire crew
单项选择题 The material used extensively as electrolytic protection around bronze propellers is（）.
单项选择题 The major components which determine the length of catenary in a deployed anchor cable are water depth，cable tension，and（）.
单项选择题 The capacity of any liferaft on board a vessel can be determined by（）.