单项选择题
On small sailing vessels，the PRIMARY reason for using nylon in a combination chain-nylon anchor line is to（）.
A.provide elasticity B.increase the strength C.reduce the cost D.reduce the weight
单项选择题 It’s no good（）down by head．
单项选择题 How should you try to right a capsized small sailing vessel?（）
单项选择题 How are lifelines attached to a life float?（）
