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In scientific work, the reference is usually water at 4°C.
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This exposure is a standard to which similar sequences may be compared when correlations are made. (геол.)
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This criterion is still in general use as a convenient yardstick for measuring the extent to which losses must be controlled in order to ...
Русско-английский научно-технический словарь переводчика. Михаил Циммерман, Клавдия Веденеева. 2003.