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| oxygen A gaseous chemical element; an essential element in cellular respiration and in combustion processes; the most abundant element in the earth's crust and about 20% of the air by volume | |||
| E 948; oxygen | |||
| diatomic oxygen | |||
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oxygen : 19 фраз в 7 тематиках |
| Землеведение | 2 |
| Металлургия | 6 |
| Окружающая среда | 2 |
| Техника | 1 |
| Транспорт | 2 |
| Химия | 3 |
| Электроника | 3 |