Auto transfer switch panels shall be free standing, indoortype, metal enclosed units with degree of protection IP42.
自动手动转换开关板应为独立式,室内型、金属外壳装置,保护等级为IP42。
2
In terms of cancer, a far more significant type of indoor air pollution is second-hand cigarette smoke.
对于癌症,更明显的室内污染源是二手烟。
3
Type 2 enclosures are intended for general purpose indoor use primarily to provide a degree of protection against limited amounts of falling water and dirt.