Русско-английский научно-технический словарь
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• It is necessary to keep the SO2 level at or below 0.01 mole percent.
• To keep (or hold) the temperature down to about 70°F, ...
Русско-английский научно-технический словарь
• It is necessary to keep the SO2 level at or below 0.01 mole percent.
• To keep (or hold) the temperature down to about 70°F, ...