单项选择题
A.furnishes support to the rudder, propeller shaft, and transom frame
B.provides foundations for after mooring winches
C.provides foundation for the main propulaion engines
D.transfers the driving force of the propller to the hull
单项选择题 0n a vesel proceeding from a very cold to a warm climate with a cargo of a nonhygroscopic nature in the holds, which is true?（）.
单项选择题 0n a vessel, the keel is the primary strength member of the lower hull form in which direction?（）.
单项选择题 0n the fully containerized ship, approximately one-third or more of the cargo is on deck above the rolling center. Top stowed containers are subject to（）.