The paper describes the development trend of digital cellular mobile communications.
本文介绍数字蜂窝移动通信的发展趋势。
The paper describes the cost compost ion and accounting system for forest fire suppression.
本文描述了森林火灾扑救成本构成与核算体系。
The paper describes the new development of satellite communication technologies at home and abroad.
本文主要介绍国内外卫星通信技术的新进展。
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