涩涩电影一区二区三区在线观看|日韩亚洲国产综合αv高清|搡老熟女老女人一区二区|日本国产欧美在线观看,欧美亚州特黄一区二区三区四区,亚洲国产午夜精品一区二区,亚洲日本VA久久一区二区

It mainly refers to diesel generators, gasoline generators which used as standby power equipment when utility interrupt in the earlier time that UPS is not appeared. However, after UPS appears, it has more advantages, like play dynamic response quickly, adjust output stability, eliminate the absorption power external adverse impact, protect the electrical equipment. Therefore, UPS gradually occupy a larger proportion in contemporary standby power.