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什么叫硬度？
正确答案：水中钙、镁离子的总含量叫硬度。
Tag：
硬度
离子
含量
时间：2025-12-07 13:08:04
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细菌基本结构含有（）。
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The slump in consumer confidence has created panic in the stock market.
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风机（）增大，则风量增大，电流上升，水温下降。
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