2020精品极品色在线_久久久久无码中文字幕_无码人成在线观看_人禽杂交av片

　　Designed in collaboration with Shanghai Electric Appliance Science Research Institute attached to the Ministry of Machinery Industry, the DW50 series of breaker is the latest generation of economical products, and its power-driven structure is the 4th core product of the company. Its novel and unique transmission structure satisfies the needs of the DW50 circuit breaker. This product has been awarded the state patent.