| 1. | Hard water furs the kettle .
硬水使水壶生水垢。 |
| 2. | Hard water which can be softened by adding sodium carbonate is called permanent hard water .
经过加入碳酸钠能被软化的硬水，称为永硬水。 |
| 3. | Study on softening of hard water by 13x - zeolite
沸石用于硬水软化的研究 |
| 4. | Household electrical appliances - performance - hard water testing
家用电器.性能.硬水试验 |
| 5. | Surface active agents - determination of stability in hard water
表面活性剂.硬水中适应性测定 |
| 6. | Household electrical appliances - performance - hard water for testing
家用电器.性能.硬水试验 |
| 7. | Household electrical appliances - performance - hard water for testing
家用电器.性能.试验用硬水 |
| 8. | Surface active agents . determination of stability in hard water
表面活性剂在硬水中稳定性的测定方法 |
| 9. | En 12458 surface active agents . determination of stability in hard water
表面活性剂.硬水中稳定性的测定 |
| 10. | Hard water furs the kettle
硬水使壶生水垢。 |
