单项选择题
The most important thing to remember when launching an inflatable liferaft by hand is to（）.
A.open the CO2 inflation valve B.open the raft container C.ensure that the operating cord is secured to the vessel D.inflate the raft on the vessel，then lower it over the side
单项选择题 The most important reason for taking anti-seasickness pills as soon as possible after entering a liferaft is to（）.
单项选择题 The limit switches on a ships survival-craft winch system（）.
单项选择题 The lights on the outside of the canopy on an inflatable liferaft operate（）.
