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关注:1
2013-05-23 12:21
求翻译:In many instances, a true “reference standard” may not be available; rather, a well-characterized material may be the only choice.是什么意思?![]() ![]() In many instances, a true “reference standard” may not be available; rather, a well-characterized material may be the only choice.
问题补充: |
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