systeminfo系统信息systemn.系统；体系；身体；制度system-command language系统指令语言system of coplanar forces共面力系system structure analysis系统结构分析system of synchronization同步系统System Validation Testing系统性能鉴定测试system optimization model系统优化模型System Discrepancy Report系统差异报告system voltage stabilizer系统电压稳定器system of standardization标准化体制system of algebraic forms代数形式系, 代数型系