单项选择题
A.valve will open later
B.valves will close later
C.amount of fuel injected will be increased
D.amount of fuel injected will be decreased
单项选择题 A drop in compression pressure in one cylinder of a diesel engine can be caused by（）
单项选择题 If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）
单项选择题 Low cylinder compression pressure and a high exhaust temperature may indicate （）