单项选择题
What should be used to steer an open lifeboat if the rudder becomes lost or damaged?（）
A.Sea anchor B.Steering oar C.Spare rudder D.Dagger board
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?（）
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?（）
