SIFXn.模拟装配夹具SIn.国际单位制similitude simulation experiment模拟实验simplicial approximation theorem单纯逼近定理SI International System of units标准国际单位制Simplified Acquisition Procedure简化了的采购程序SIOP Additive Spare Support SIOP附加备用支援simplified code signaling system简化的编码信号系统Simulator Data Integrity Program同步数据完整程序Simmian immunodeficiency viruses猴免疫缺损病毒simulatve and statistical method模拟统计法simplification to real structure结构简化