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 A block that can be opened at the hook or shackle end to receive a bight of the line is a（）.
单项选择题 You can safely step in the bight of a line（）.
单项选择题 When a pilot is on board to pilot the vessel the Letter（）must be hoisted.
