单项选择题
After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
A.frequent opening of hatches to permit entry of fresh air B.regular checks of bilge levels C.use of ear plugs to dampen engine noise D.frequent flushing of the water spray system with fresh water
单项选择题 A vessel fishing at night，with gear extending more than 150 meters horizontally outwards，will show in the direction of the gear（）.
单项选择题 A shore is a piece of securing dunnage that（）.
单项选择题 A ship is responsible for the cargo loaded or unloaded（）.
