multiple proportions，law of
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        Proposed byDalton in 1804,the principle that when twoelements A and B combine to form morethan one compound,the weights of B thatcombine with a fixed weight of A are insmall whole-number ratios. For example,indinitrogen oxide,N2O,nitrogen monoxide,NO,and ......（本文共 420 字）     [阅读本文] >>