单项选择题
An inflatable liferaft is thrown into the water from a sinking vessel. What occurs automatically after the painter trips the CO2 bottles to inflate the raft?（）.
A.The sea anchor deploys B.The floor inflates C.If upside down，the craft rights itself D.The painter detaches from the raft
单项选择题 An inflatable liferaft is hand-launched by（）.
单项选择题 An inflatable liferaft can be launched by（）.
单项选择题 All lifeboats，rescue boats，and rigid-type liferafts shall be stripped，cleaned，and thoroughly overhauled at least once every（）.
