回复xiaodaiban发表于：2020/3/15 9:43:07悬赏金额：
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Spectra were measured with the external locking mode at various temperatures. chemical shifts were determined on an expanded scale (18 ppm per full scale) with the precision of 0.10 ppm.
这里的 external locking mode和an expanded scale (18 ppm per full scale)都是什么意思啊？
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