单项选择题
Two types of anchor shackles which are currently available are（）.
A.U-Type and posilok shackles B.C-Type and wedge shackles C.D-Type and bow shackles D.wedge and kenter shackles
单项选择题 The revolving drum of a winch used to haul lines is called a（）.
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（）.
