单项选择题
A.position the boat at the embarkation station
B.lift the boat off the inboard chocks
C.energize the winch for the falls
D.set the brake on the winch
单项选择题 A helicopter making a round trip from a helideck with refueling capabilities to an unmanned platform will take 45 minutes each way. The helicopter should be carrying enough fuel to last（）.
单项选择题 A floating ship with an initial negative metacentric height（）.
单项选择题 A capsized small sail vessel is best righted when what part of the vessel is downwind?（）