“parts per million (ppm)”的概念、定义、翻译、参考文献-科学参考

单词	parts per million (ppm)
释义	parts per million (ppm) 兆比率
随便看	locking control voltage locking course locking crank locking cross bar locking cylinder locking device locking dog lock in gear locking escape locking face locking fastener locking force locking frequency locking gasket lock(ing)gear locking gear locking handle locking hole locking key locking latch locking latches locking lever locking lip locking lug locking lugs

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