英语词汇“PPM”的读音、翻译、释义、用法及例句-语文网

词汇	PPM
释义	PPM 百万分之一 parts per million的简称，即百万分之一，为微量分析、计量上用来表示浓度的单位，日常生活中常用在空气污染、水污染等各种微量物质的分析上。例如一公升的水中含某物5毫克，即称该物的浓度为5PPM.
随便看	system macro system macro definition system macro instruction system management facilities system management monitor system master tape system measurement facility system message field system mistake system modification program system modification program extended system monitor system name system name table system network architecture system nucleus system operation system operator system operator station system output device system output writer system overhead system parameter record system parameter table system partition

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