源码文件
PROJCS["Xian_1980_3_Degree_GK_CM_90E",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.0…
xian 源代码
线性技术（xian）是电子工程中不可或缺的一部分，专注于信号处理与系统设计的精确度和稳定性。从基础的放大器电路到复杂的控制系统，线性技术在通信、自动化控制以及音频处理等领域发挥着关键作用。掌握这一领域的知识不仅能够帮助工程师们解决实际工作中的难题，还能激发创新思维，推动新技术的发…
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源码文件
PROJCS["Xian_1980_GK_Zone_24N",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.0],UNIT[…
源码文件
PROJCS["Xian_1980_GK_Zone_23",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.0],UNIT["…
源码文件
PROJCS["Xian_1980_3_Degree_GK_Zone_28",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.…
源码文件
PROJCS["Xian_1980_3_Degree_GK_CM_33E",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.0…
源码文件
PROJCS["Xian_1980_3_Degree_GK_Zone_45",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.…
源码文件
GEOGCS["1980XiAn",DATUM["1980XiAn",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199…
源码文件
PROJCS["Xian_1980_3_Degree_GK_CM_129E",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.…
源码文件
PROJCS["Xian_1980_3_Degree_GK_CM_147E",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.…
源码文件
PROJCS["Xian_1980_3_Degree_GK_Zone_41",GEOGCS["Xian_1980",DATUM["",SPHEROID["",6378140.0,298.2569999999957]],PRIMEM["Greenwich",0.…