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| water hardness The amount of calcium and magnesium salts dissolved in water (钙和镁的盐类在水中的溶解量。) | |||
| water hardness | |||
| hardness of water | |||
| alkaline hardness | |||
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水的 硬度 : 6 phrases in 6 subjects |
| Desert science | 1 |
| Drilling | 1 |
| Engineering geology | 1 |
| General | 1 |
| Technology | 1 |
| Water resources | 1 |
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