单项选择题
A.flame temperature B.fuel oil C.air movement D.gas forces
（） clearances in the main or crank pin bearings will so...
单项选择题（） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.
A.Too larger B.Too smaller C.Excess D.Excessive
（） supplies pilot air to control the cylinder air start...
单项选择题（） supplies pilot air to control the cylinder air start valves.
A.An air compressor B.An indicator cock C.An air distributor D.A safety valve
（） may have two emergency source of power, thus requiri...
单项选择题（） may have two emergency source of power, thus requiring two emergency switchboards.
A.Large passenger vessels B.General cargo ships C.Container ships D.Oil tankers
