问题描述： radio began as ship-to-ship and ship-to-land c___ 填什么 1个回答 分类：数学 2014-11-17 问题解答： 我来补答 adio began as ship-to-ship and ship-to-land communicaiton. 通信无线电开始用于船舶之间及船舶与陆地的通信 展开全文阅读
