随后引入了一种新的定标方法校正因子法，可扩大用作参考的标准仪器的范围。
A new type calibration method, the correction factor method, is proposed, which can expand the scope of instrument used as the reference standard.
如果我们能够获取所有数据，我们会发现，我们可以用作参考的长期数据贷款池是很小的。
The pool of loans with long term data we can really use is very small, if at all available.
请注意，此课程有很多视频、脚本(PDF文件)以及电子书的链接用作参考。
Note the course has many videos, transcripts (PDF files), and links to an eBook to use as reference.
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