单项选择题
The total starting air capacity required for reversible main engines is to be sufficient for at least （）.
A.six consecutive starts B.eight consecutive starts C.ten consecutive starts D.twelve consecutive starts
单项选择题 A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.
单项选择题 Lube oil pumps taking suction from the sump of most small marine engines are usually （）.
单项选择题 Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.
