A、A.Ⅰonly
B、B.Ⅱonly
C、C.bothⅠand Ⅱ
D、D.neitherⅠnor Ⅱ
更多“In a diesel engine, exhaust valves open before the intake ports are uncovered to （）<br /> Ⅰ.reduce pumping losses<br /> Ⅱ.reduce back pressure<p> In a diesel engine, exhaust valves open before the intake ports are uncovered to （）<br /> Ⅰ.reduce pumping losses<br /> Ⅱ.reduce back pressure</p>”相关的问题
A、Diesel engines have more advantages in comparison with gasoline engines B、Diesel engines have more advantages in comparison to gasoline engines C、Gasoline engines have more advantages in comparison with diesel engines D、Gasoline engines have more advantages in comparison to diesel engines
A、most critical in a four-stroke cycle diesel engine B、most critical in a two-stroke/cycle diesel engine C、most critical in a four-stroke/cycle diesel engine if it is turbocharged D、of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
A、bearing pressure in a four-stroke\cycle acting single diesel engine is continually reversed B、bearing pressure in a two-stroke\cycle single acting diesel engine is continually reversed C、the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine D、two-stoke/cycle diesel engines require more complicated lubrication piping
A、one half crankshaft speed in a two-stroke cycle diesel engine B、crankshaft speed in a two-stroke cycle diesel engine C、two times crankshaft speed in a two-stroke cycle diesel engine D、one-fourth times crankshaft speed in a four-stroke cycle diesel engine
A、ignition lag B、engine horsepower C、lube oil system pressure D、specific fuel consumption
A、two crankshaft revolutions in a two-stroke/cycle engine B、two power strokes in a two-stroke/cycle engine C、one power stroke in a two-stroke/cycle engine D、two piston strokes in a two-stroke/cycle engine
A、The direction of pressure on the journal in four-stroke engine is continuously B、positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine C、four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines D、Low-stroke engines usually consume less lube oil than four-stroke engines
A、In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater B、Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports C、No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine D、The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine
A、a modern diesel engine；a turbine wheel B、a modem diesel engine；exhaust gases C、a compressor；an exhaust gas turbocharger D、a compressor；a turbine wheel
A、chromium plating piston rings B、knurling the piston skirt C、extended maximum power operation D、applying load to a cold diesel engine
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