calling order
利用扩展AT命令的实现原理，完善了对AT模块软件的设计，并最终实现了通话管理的主要功能。
By using the realization principles of the expanded at commands, it perfects the design of at module and ultimately achieves the main functions of call management.
youdao
应用推荐
模块上移
模块下移
不移动