目前的移动通信系统工作在哪个频段()A、VHF B、UHF C、SHF D、EHF 发布时间:2019-12-09 05:07 │ 来源:www.tikuol.com 题型:单项选择题 问题: 目前的移动通信系统工作在哪个频段()A、VHFB、UHFC、SHFD、EHF
题型:单项选择题 He made a quick _____ from an unfriendly to a friendly manner when he saw that we could help him. [ ]A. decision B. preparation C. switchD. difference 查看答案