What do the numbers in front of the material in the Nelson curve represent?
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In the Nelson curve, those numbers 1, 2, etc. next to the symbols. . . What does 23 mean?
Nelson curve, from API941; the numbers represent the reference sequence numbers, while the letters are the annotation sequence numbers, and they do not affect the material selection.
The reply upstairs is very accurate; the practices abroad are different from those in China
The reply upstairs is very accurate; the practices abroad are different from those in China
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