单项选择题
A.increase in engine speed
B.increase in cylinder turbulence
C.leaking needle valve
D.reduction in cylinder turbulence
单项选择题 While maneuvering, you discover heavy smoke coming from the turbocharger casing, you should （）
单项选择题 Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）
单项选择题 In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.