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06 мая 2011 г.
Abelard-Schuman. 1958. 175 p. Chemists divide all substances into two classes. In one class are such things as olive oil, sugar, starch, glue, gelatin, silk, rubber, paper, and penicillin. These are examples of organic substances. In the other class are such things as air, water, sand, clay, salt, gold, silver, iron, brass, glass, and concrete. These are examples of inorganic substances. The distinction between the two emerged when it became evi...