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| |||
| shoeshine | |||
| bitumen; shoe polish | |||
| cream for footwear; polish | |||
| pitch | |||
| bitumen A generic term applied to natural inflammable substances of variable colour, hardness, and volatility, composed principally of a mixture of hydrocarbons substantially free from oxygenated bodies. Bitumens are sometimes associated with mineral matter, the nonmineral constituents being fusible and largely soluble in carbon disulfide, yielding water-insoluble sulfonation products. Petroleum, asphalts, natural mineral waxes, and asphaltites are all considered bitumens | |||
| asphalt; asphalt cement | |||
| betun: 61 短语, 13 学科 |
| 一般 | 3 |
| 专利 | 2 |
| 农业 | 3 |
| 化学 | 15 |
| 卫生保健 | 1 |
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| 机械工程 | 2 |
| 材料科学 | 2 |
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| 石油/石油 | 3 |
| 能源行业 | 1 |
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