不到一刻钟，夜晚的寒气就一扫而光。Within quarter of an hour the coldness of the night had gone.空气稀薄清新，其间日光蒙眬，寒气逼人。The air was thin and crisp, filled with hazy sunshine and frost.今天早晨寒气袭人。There's a chill in the air this morning....
Don't be surprised to find your biggest interrupter is your boss!如果你最大的被打扰的来源是你的老板的话你千万不要感到奇怪!The vacuum degreevacuum interrupter will have the direct effect upon the properties of vacuum switch.真空灭弧室内真空度将直接影响真空开关的性...