Three-dimension vegetative net for planting grasses by spraying sowing is a new technique that can be used to stony roadside slope.
2
阐述了GPS公路勘测三维控制网的构建方法、构建过程、构建原则及注意事项。
The article expounds the establishment method, establishment process, establishment principles and points for attention of the three dimensional control network in GPS highway engineering survey.
3
现代通信系统是陆-海-空三维通信网,三维通信网的组成主要制约于水下通信。
Modern communication system is a land-sea-space three-dimensional communication network whose realization is mainly restrained by underwater communication.