单项选择题
What is NOT a function of the air supply of a covered lifeboat?（）
A.Provides air for engine combustion B.Pressurizes water spray system C.Provides air for passenger respiration D.Prevents smoke and other noxious fumes from entering craft
单项选择题 Under normal conditions a liferaft is released from itscradle by（）.
单项选择题 Two individuals authorized to serve as a lifeboatman must be assigned to any lifeboat that has a capacity of more than（）.
单项选择题 The water pockets located on the underside of inflatable liferafts（）.
