If a short circuit occurs the current will rise rapidly through these switches and when it reaches a predetermined trip level, both devices turn off simultaneously.
如果出现短路电流将迅速上升,通过这些开关,当它到达预定的访问级别,这两种设备同时关闭。
Simultaneously, due to the scarcity of urban land, more and more high-rise buildings, underground space's development and utilization become an important way to try and ease congestion in the city.
同时,由于城市土地资源的稀缺,高层建筑越来越多,地下空间的开发利用成为解决城市拥挤问题的重要途径。
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