| 单词 | oxygen |
| 释义 | Word Frequency oxygen(ˈɒksɪdʒən) noun a. a colourless odourless highly reactive gaseous element: the most abundant element in the earth's crust (49.2 per cent). It is essential for aerobic respiration and almost all combustion and is widely used in industry. Symbol:O; atomic no: 8; atomic wt: 15.9994; valency: 2; density: 1.429 kg/m3; melting pt: –218.79°C; boiling pt: –182.97°C b. (as modifier) an oxygen mask Derived forms oxygenic (ˌɒksɪˈdʒɛnɪk) or oxygenous (ɒkˈsɪdʒɪnəs) adjective |
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