单项选择题
A.breaking the weak link
B.releasing the tie-down strap
C.pulling the operating cord
D.releasing the CO2 canister
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?（）.
单项选择题 An inflatable liferaft is hand-launched by（）.