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 foundations for the main propulsion engines
D.transfers the driving force of the propeller to the hull
单项选择题 On a ship，the possibility of a blowout makes which type of diesel engine shutdown desirable?（）
单项选择题 My ship’s engine responds well to telegraph orders and takes about 80 seconds to reverse from full speed ahead to full speed astern.This sentence（）.
单项选择题 Most medium and slow speed diesels are started by what medium?（）