... oil film(on coastal waters)沿海原油浮油油膜 NB engine自然吸气式发念头；非增压式发念头 hydrographelloc survey水路丈量 ...
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To enhance the anti-wearing ability of exhaust valve seat for a new engine, a Nb-Cr-Mo-V cast iron value seat has been developed in the First Automobile Works.
为提高新型汽车发动机排气门座的耐磨性，第一汽车制造厂研制了铌铬钼钒铸铁排气门座。
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