Three digital communication models to realize information dual-direction transmission are brought forward and their characteristics and applied situation are analyzed.
提出了三种实现信息双向传输的数字通信模型，分析了它们各自的特点和应用场合。
"Digital water" is based on spatial information, integrating of hydrological models, water service, and modern electronic communication technology, professional system platform.
“数字水利”是以空间信息为基础，融合水文模型、水利业务和现代电子通信等技术的专业化系统平台。
"Digital water" is based on spatial information, integrating of hydrological models, water service, and modern electronic communication technology, professional system platform.
“数字水利”是以空间信息为基础，融合水文模型、水利业务和现代电子通信等技术的专业化系统平台。
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