单项选择题
A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）
A.slightly less than atmospheric pressure B.approximately equal to exhaust manifold pressure at all times C.that is widely fluctuating constantly D.decreasing as engine load increases
单项选择题 The lube oil pump used in a diesel engine is a （）.
单项选择题 Most fuel injection nozzles are opened by （）.
单项选择题 The total starting air capacity required for reversible main engines is to be sufficient for at least （）.
