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【简答题】
已知某二元弱酸H2B在水中的Ka1=1.0×10-5，Ka2=4.0×10-9，则0.1mol·L-1 H2B溶液的pH约为(数值格式例：2.4)
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【简答题】Tu vas au magasin ? Oui, ________________ Non, _______________
【简答题】Officials from around the world have agreed to support a 1. ________ increase in hydrogen technology. Japan announced Wednesday that energy ministers or delegates from 30 countries are supporting a pl...
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【简答题】Tu vas au magasin ? ( oui )
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