单项选择题
A.later and closing earlier
B.later and closing later
C.earlier and closing earlier
D.earlier and closing later
单项选择题 When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）
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 （）