单项选择题
The main advantage of a Chinese stopper over the one line stopper is that it（）.
A.will not jam on the mooring line B.is stronger C.is easier to use when under heavy tension D.is safer to use when under heavy tension
单项选择题 The line with the most stretch is（）.
单项选择题 The latch of a safety hook（）.
单项选择题 The knot used to join two lines or two large hawsers for towing is called a（）.
