男人J桶女人P免费视频,无毛一线天嫩穴19,av频在线观看免费高清下载,淫欲淫色淫香视频,成人网站免费观看视频,亚洲精品生活一区二区三区,国产一区二区三区91,日本精品床戏做爰

The 27.5kV permanent magnetic circuit breaker is used to close and open the rated current and fault short circuit current of the traction power supply system, and is an outdoor type device that can be installed in traction substations, subdivision stations, opening and closing stations, AT stations, switching stations and along railway lines. The 27.5kV permanent magnetic circuit breaker adopts air-insulated, vacuum-extinguished operation mode, and the operating mechanism is a monostable permanent magnetic mechanism with reliable operation, excellent characteristics, efficient transmission and streamlined components.