为适应汽油无铅化及汽车排气净化装置的要求，开发出了高铬铸铁排气阀座。
In order to be suitable for the leadfree gasoline and meet the demand of automotive exhaust gas equipment, exhaust valve seat made of high-chromium cast iron is developed.
开发了一种柴油机排气净化装置，试验表明该装置对减少柴油机烟度具有较好的效果。
The trial indicates that the equipment possesses good effects on decreasing diesel engine's smoke.
开发了一种柴油机排气净化装置，试验表明该装置对减少柴油机烟度具有较好的效果。
The trial indicates that the equipment possesses good effects on decreasing diesel engine's smoke.
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