Building underground channel indoor is an important component part of the north China architecture. But it has been ignored for a long time, as a result, there are a great many quality problems.
建筑室内地沟是北方建筑的一个重要组成部分，但长期以来一直不被人们所重视，导致其存在很多质量问题。
The ramming pipe drapery is used for support to construct the crossing structures of underground passage, blind channel and etc.
用夯管帷幕作为支护来建造地下通道、暗渠等穿越构造物，在城市建设中是一项新的施工工艺。
The plan to repair and reinforce the underground inclined channel of a uranium tailings dam and the application of PCC material in the project are introduced in detail.
较详细地介绍了某铀尾矿库排水斜槽维修加固方案和PCC材料在该工程中的应用。
Then, the paper introduced the basic concepts of wireless channel transmission mechanism as well as the characteristics of radio wave propagation in underground tunnels;
然后介绍了无线信道的传播机制基本概念以及井下巷道电波传播特性；
Then, the paper introduced the basic concepts of wireless channel transmission mechanism as well as the characteristics of radio wave propagation in underground tunnels;
然后介绍了无线信道的传播机制基本概念以及井下巷道电波传播特性；
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