单项选择题
The revolving drum of a winch used to haul lines is called a（）.
A.bull gear B.gypsyhead C.spanner D.wildcat
单项选择题 The purpose for the bag or box on top of some survival craft is to（）.
单项选择题 The locking pin that joins the parts of a detachable link is held in position by（）.
单项选择题 The lifeline of a life float or buoyant apparatusshall（）.
