表示液体为酸性或碱性的数值，范围是0.0到14.0。当pH值 接近7.0时为中性；高于此值为碱性，低于此值为酸性。
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表示液体为酸性或碱性的数值，范围是0.0到14.0。当pH值 接近7.0时为中性；高于此值为碱性，低于此值为酸性。
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