If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.

A．the crankcase explosion

B．lifting of the cylinder safety valve

C．a scavenge fire

D．opening of the manhole

[单选题]If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in （）.A . the crankcase explosionB . lifting of the cylinder safety valv

[单选题,A1型题] The purpose of the flame in flame atomic-absorption spectroscopy is to（）A . Purify the sampleB . Desolvate and atomize the analyte atoms in a sampleC . Excite the analyte atomsD . Ionize the analyte atoms

[单选题]Flame Detail指的是（）。A . 火焰的大小B . 火焰精细度C . 火焰的高度D . 火焰的样本数

[单选题]When there is a flame failure in an automatically fired auxiliary boiler, the （）.A . air supply is shut offB . fuel supply is shut offC . water supply is shut offD . safety valve lift

[单选题]In the presence of an open flame or hot surfaces, chlorinated flourocarbon refrigerants decomposes and form .A．petroleum crystalsB．phosgene gasC．water vaporD．carbon monoxide

[单选题]Engine displacement is equal to the cylinder （）.A . area times the strokeB . area times the stroke, times the number of cylindersC . volume times the strokeD . volume times the stroke, times the number of cylinder

[单选题]There is an injection pump for each cylinder, which is usually operated once every cycle by （） on the camshaft.A . a gearB . a camC . a rodD . a miler

[单选题]The sequence of fuel injection into cylinders is determined by （）.A . the steeringB . the driven gearC . the turning gearD . the timing gear

[单选题]Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.A . low compression pressureB . increased piston wearC . increased cylinder lube oil consumptionD . poor contact between compression rings and l

[单选题]Fuel is admitted to a diesel engine cylinder through the （）.A . intake valvesB . carburetorC . exhaust portsD . injector nozzle