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| ppb by weight (MichaelBurov); ppbw (неточно вместо ppbm; чаще: ppb by weight MichaelBurov); parts per billion by weight (MichaelBurov) | |||
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| ppb by weight (MichaelBurov); ppbw (неточно вместо ppbm; чаще: ppb by weight MichaelBurov); parts per billion by weight (MichaelBurov) | |||