What Class A qualified surveying and mapping units are there in Xi'an? Is it easy to get in?

Xi'an Class A (29) China Earthquake Administration Second Monitoring Center China Electric Power Engineering Consulting Group Northwest Electric Power Design Institute China Nonferrous Metal Industry Xi'an Survey and Design Institute China Water Conservancy and Hydropower Third Engineering Bureau Co., Ltd. China Railway First Survey and Design Institute Group Co., Ltd. China Coal Xi'an Design Engineering Co., Ltd. China Communications Construction Company First Highway Survey and Design Institute Mechanical Industry Survey and Design Institute National Bureau of Surveying and Mapping First Geodetic Team (National Bureau of Surveying and Mapping Precision Engineering Surveying and Mapping Institute) National Surveying and Mapping The First Topographic Survey Team of the National Bureau of Surveying and Mapping (Second Institute of Surveying and Mapping of Shaanxi Province) The Second Topographic Survey Team of the National Bureau of Surveying and Mapping (Third Institute of Surveying and Mapping of Shaanxi Province) The Geodetic Data Processing Center of the National Bureau of Surveying and Mapping (The First Aerial Survey and Remote Sensing Institute of the National Bureau of Surveying and Mapping (The Third Institute of Surveying and Mapping of Shaanxi Province) 5. Institute of Surveying and Mapping Engineering) Shaanxi Basic Geographic Information Center of the National Bureau of Surveying and Mapping (Shaanxi Surveying and Mapping Data Archives of the National Bureau of Surveying and Mapping) Northwest Institute of Non-ferrous Metal Surveying and Mapping Northwest Comprehensive Survey and Design Institute Shaanxi Provincial Coalfield Geology Bureau Geophysical Survey Team Shaanxi Provincial Geological and Mineral Exploration and Development Bureau Surveying and Mapping Team (Shaanxi Institute of Land Engineering Surveying and Mapping) Shaanxi Provincial Water Conservancy and Electric Power Survey and Design Institute Shaanxi Provincial Highway Survey and Design Institute Shaanxi Tianrun Technology Co., Ltd. Xi’an Map Publishing House (Shaanxi Provincial Sixth Institute of Surveying and Mapping Engineering) Xi’an Huati Aerial Photography and Remote Sensing Co., Ltd. Xi’an Coal Hangzhou Information Industry Co., Ltd., Xi'an Changqing Technology Engineering Co., Ltd., Xi'an Building Materials Geological Engineering Survey Institute, Xi'an China Survey Engineering Co., Ltd., Xi'an Survey and Surveying Institute, Xi'an Geodetic Surveying and Mapping Engineering Co., Ltd., it should be difficult to enter.