单项选择题
When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）
A.quantity of fuel injected is decreased B.quantity of fuel injected will always be increased C.start of injection is advanced D.duration of injection will always be greater
单项选择题 Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）
单项选择题 A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an （）
单项选择题 Black smoke exhausting from an operating diesel engine can be caused by （）
