单项选择题
A.secured forward and aft where readily available
B.secured amidships where they will not hinder the personnel
C.used for fending off
D.used for picking up survivors in the water
单项选择题 When landing a lifeboat through heavy surf with a strong current running parallel to the beach (from right to left when facing from seaward) the recommended procedure is to（）.
单项选择题 When backing a motor propelled lifeboat (right-hand propeller) with the rudder amidships，the stern will back（）.
单项选择题 When abandoning ship，after launching the motor lifeboat you should（）.