大气层里二氧化碳含量的测量单位是ppm，即一百万体积的空气中所含二氧化碳的体积数。
The level of carbon dioxide in the atmosphere is measured in parts per million (PPM).
镀液单位体积的重量是焦磷酸钾和焦磷酸铜含量的函数。
The weight of copper plating solution in a unit volume was function of contents of cupric pyrophosphate and potassium pyrophosphate.
镀液单位体积的重量是焦磷酸钾和焦磷酸铜含量的函数。
The weight of copper plating solution in a unit volume was function of contents of cupric pyrophosphate and potassium pyrophosphate.
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