Liangjia Coal Mine in Longkou mining area is a typical "three-soft" mining area, meeting many difficulties in roadway support.
龙口矿区梁家煤矿是典型的“三软”矿区，在巷道支护上遇到了非常大的困难。
Because of the engineering project the development and utilization of groundwater in downstream plain area of Huangshui river in Longkou city come to a new level.
该工程使龙口市黄水河中下游平原区地下水得到了充分的开发利用。
Xinli mining area of Sanshandao gold deposit is the first hard rock mine which belongs to the under-sea deposit in our country, and only Longkou is mining coal under sea in domestic.
三山岛金矿新立矿区是我国第一个进行海底采矿的硬岩矿山，国内仅龙口在海下采煤。
Longkou power plant, Shandong province is located in an area of soft sandy clay layer liable to liquification.
龙口电厂建于山东省可液化的软土层地基上。
Longkou power plant, Shandong province is located in an area of soft sandy clay layer liable to liquification.
龙口电厂建于山东省可液化的软土层地基上。
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