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关注:1
2013-05-23 12:21
求翻译:the average mass of naturally occurring atoms of an element on a scale where the carbon-12 atom has a mass of exactly 12 units是什么意思?![]() ![]() the average mass of naturally occurring atoms of an element on a scale where the carbon-12 atom has a mass of exactly 12 units
问题补充: |
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