A、provide added wear protection against today’s corrosive quality of fuel
B、increase overall valve strength due to the high gas pressures
C、assist in dissipating heat due to the extreme operating temperatures
D、reduce the overall weight of the valve thus helping eliminate valve spring surge and hammering
更多“Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to （）”相关的问题
A、<em>Dieselem> <em>engineem>s have more advantages in comparison with gasoline <em>engineem>s B、<em>Dieselem> <em>engineem>s have more advantages in comparison to gasoline <em>engineem>s C、Gasoline <em>engineem>s have more advantages in comparison with <em>dieselem> <em>engineem>s D、Gasoline <em>engineem>s have more advantages in comparison to <em>dieselem> <em>engineem>s
A、A.it has a longer power stroke B、B.more air gets into the cylinder each stroke C、C.it develops twice as <em>manyem> power strokes at the same speed D、D.higher combustion pressure is developed
A、most critical in a four-stroke cycle <em>dieselem> <em>engineem> B、most critical in a two-stroke/cycle <em>dieselem> <em>engineem> C、most critical in a four-stroke/cycle <em>dieselem> <em>engineem> if it is turbocharged D、of equal importance in a two-stroke/cycle <em>dieselem> <em>engineem> as in a four-stroke/cycle <em>dieselem> <em>engineem>
A、bearing pressure in a four-stroke\cycle acting single <em>dieselem> <em>engineem> is continually reversed B、bearing pressure in a two-stroke\cycle single acting <em>dieselem> <em>engineem> is continually reversed C、the maximum bearing pressure is higher in a single acting two-stroke/cycle <em>dieselem> <em>engineem> D、two-stoke/cycle <em>dieselem> <em>engineem>s require more complicated lubrication piping
A、inboard <em>dieselem> <em>engineem> B、outboard <em>dieselem> <em>engineem> C、outboard gasoline <em>engineem> D、inboard gasoline <em>engineem>
A、Slow speed <em>dieselem> <em>engineem>s B、Medium-speed <em>dieselem> <em>engineem>s C、Steam <em>engineem>s D、Gasoline <em>engineem>s
A、improve fuel economy B、increase the air charge velocity C、reduce the risk of explosion D、all of the above
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