单项选择题
A.the call sign and name
B.the official number and name
C.the port of registry and name
D.the port of registry and official number
单项选择题 As a vessel sinks to a depth of 15 feet，the hydrostatic trip releases the liferaft container from its cradle by（）.
单项选择题 An inflatable liferaft should be manually released from its cradle by（）.
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?（）.