单项选择题
What is placed on the under side of an inflatable liferaft to help prevent it from being skidded by the wind or overturned?（）
A.Water pockets B.A keel C.Strikes D.Sea anchor
单项选择题 What is one of the FIRST things you would do on boarding an inflatable liferaft?（）
单项选择题 What is NOT a function of the air supply of a covered lifeboat?（）
单项选择题 Under normal conditions a liferaft is released from itscradle by（）.
