单项选择题
Opening of the cylinder （） will admit compressed air into the cylinder.
A.safety valve B.indicator cock C.blow-down valve D.start valve
单项选择题 Once all cylinders are firing regularly, （） is shut off.
单项选择题 Once a scavenge fire is detected, fuel should be shut off from the affected cylinders and cylinder lubrication increased （） the risk of seizure.
单项选择题 Once a scavenge fire is detected the engine （）.
