档案标引步骤主要（）和（）两个方面。
参考答案：主题分析、概念转换
There ________ great changes in Zhangzhou since 2010.
A. have had B. has been C. have been
按服务航线和规模可将机场划分为枢纽机场、干线机场、支线机场。（）
