JIS X 5150 AMD 1 ERRATUM 1:2000信息技术.用户室内设备用通用电缆铺设(修改件1和2.勘误1)Information technology -- General cabling for customer premises (Amendment 1 and Amendment 2; Erratum 1)作废首页 标准 JIS X 5150 AMD 1 ERRATUM 1:200