机套 meaning in English

case
mantle

Conduits and fittings for electrical installation ; flexible corrugated and inflammable conduits of insulating material with plain mantle and for heavy pressure load
电气设备用导管和配件.第2部分:带普通机套绝缘材料和
The gravure printer registration system was researched . the registration detecting way , controlling principle , control calculation way was discussed , and factors influencing system work precision were analyzed
摘要针对凹印机套准系统的重要性和套准误差的检测控制方法，分析和研究了国产套准调节系统的检测方式、控制原理与算法，分析了影响系统工作精度的具体因素。