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The higher a substance’s pH, the more acidic it is.
【参考答案】
N
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有些人认为英雄主义已不适应新时代了2. 但是,当今社会里确有英雄主义存在3. 你的看法 Does Heroism Still Work
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Acid rain may damage trees, soils and accelerate the decay of buildings.
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