单项选择题
A “bowline” is used to（）.
A.join lines of equal size B.form a temporary eye (loop) at the end of a line C.be a stopper D.keep a line from fraying
单项选择题 “safe speed” is defined as that speed where（）.
单项选择题 Deep-sea liners are（）.
单项选择题 The document which shows a vessel’s nationality，ownership，and tonnage is the（）.
