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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 |
水的硬度 : 6 phrases in 6 subjects |
Desert science | 1 |
Drilling | 1 |
Engineering geology | 1 |
General | 1 |
Technology | 1 |
Water resources | 1 |