单项选择题
If a mooring line should part while you are tying up at a dock，you should make a temporary eye by tying a（）.
A.becket bend B.clove hitch C.bowline D.square knot
单项选择题 How many adult life jackets are required on board a ship?（）
单项选择题 Heavy fuel oils when spilled are（）.
单项选择题 Each life preserver must be readily accessible to the person for whom it is intended while he or she is（）.
