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parts+per+million(ppm)

网络释义

短语

parts per million ppm 百万分之几

PPM - Parts Per Million 百万分之

parts per million control ppm 妨害

PPM- Parts Per Million 百万分之

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双语例句

  • Levels of the gas at the Zeppelin research station on Svalbard, northern Norway, last week peaked at over 397 parts per million (PPM), an increase of more than 2.5ppm on 2008.

    挪威北部瓦尔巴群岛齐柏林研究站上周记录二氧化碳气体水平最高值超过397个百万分点,2008年水平增加了2.5个百万分点。

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  • All the methods give the same result: the concentration of oxygen is declining everywhere at the same rate, about 20 parts per million (PPM) per year.

    所有这些方法得到同样结论:地球上所有地方含氧量正在同样的速度(大约每年0.002%)减少。

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  • The pre-industrial carbon dioxide amount was 280 parts per million (ppm). Humans, by burning coal, oil and gas, have increased this to 385 ppm; it continues to grow by about 2 ppm per year.

    前工业时代二氧化碳含量280ppm人类燃烧煤炭油气的行为使其上升385ppm而这一数值还在每年2ppm的速率增长

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