单项选择题
A.a leaking fuel injector nozzle
B.a clogged air filter
C.excessively early fuel injection
D.malfunctioning valves
单项选择题 One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）
单项选择题 The exhaust system for a turbocharged two-stroke/cycle diesel engine functions to（）
单项选择题 Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）