SQL语句的方式应该是您选择的最后一种方式，如果上面几种方法不适合您的话。
SQL statements should be used only as a last resort, if no other method of querying the database will work.
介绍了双效精馏的原理和几种典型的操作方式，阐明了双效精馏的选择依据和应用原则。
This paper introduces the principle and typical operational modes of double effect distillation, and discusses its selection and application.
提出了以提高线性记录密度为目的的优化选择结构参数的准则，同时对常用的几种RLL编码方式进行了比较。
The principle of optimal selection of RLL code parameters which achieve high linear density is also proposed. Comparisons of several RLL codes are given at last.
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