单项选择题
A.exhaust manifold
B.valve bridge
C.pressure of the fresh air charge
D.valve adjusting gear
单项选择题 If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be （）
单项选择题 One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）
单项选择题 A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）