Then, several suggested selective methods for the core books on two stages, the elementary and secondaryselection were presented.
然后，从初选和复选两个层面，提供了选择核心图书的几种方法。
2
Modifying the contents of a secondary drop-down box based on a selection made in the first.
基于第一个下拉框中所做的选择来修改第二个下拉框的内容。
3
Selection of the primary and secondary airflow rate, the guide Angle of the blade, the primary air ratio as well as the material for manufacture of the burner nozzle are given.