单项选择题
On a single-screw vessel the stern frame（）.
A.furnishes support to the rudder，propeller shaft，and transom frame B.provides foundations for after mooring winches C.provides foundations for the main propulsion engines D.transfers the driving force of the propeller to the hull
单项选择题 In selecting a tug for moving a vessel，consideration should be given to its（）.
单项选择题 In order to reduce your wake in a narrow channel you should（）.
单项选择题 In most cases，when a large merchant vessel enters shallow water at high speed the（）.
