单项选择题
An on-load release system on a survival craft means the cable can be released（）.
A.only when the load is taken off the cable B.only when there is a load on the cable C.only when activated by the controls at the lowering station D.at any time
单项选择题 An effective braking system for windlasses on rigs in deep water is a(n)（）.
单项选择题 A wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from（）.
单项选择题 A tackle is two blocked when the blocks are（）.
