A research was made on the structure of piston ring and elastic force ring in oilless lubrication compressors.
对全无油压缩机上活塞环弹力环结构进行了研究。
Most of these large boiler burners arranges into a hedge form and adopts the oilless ignition mode for startup.
这些大型锅炉燃烧器多布置成对冲形式，启动时也多采用无油点火方式。
Most of these large boiler burners arranges into a hedge form and adopts the oilless ignition mode for startup.
这些大型锅炉燃烧器多布置成对冲形式，启动时也多采用无油点火方式。
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