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浓水反渗透浓水补水至三循，三循（）及碱度增加。
浓水反渗透浓水补水至三循，三循（）及碱度增加。
正确答案：钙硬
标签：
碱度
反渗透
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The authorities are willing to permit a run-down in the country’s international reserves over the next few years as means of accelerating the introduction of foreign technology.
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Another 20% worked well， but the remaining 60% should have been scrapped.