分布式结构集中组屏式综合自动化系统在中低压变电所应用最多,它具有分布式结构的全部优点,系统便于扩充、维护,某个环节故障不影响其他部件的正常运行。
Goods are carried by several of transport--on road or rail, by sea or air.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧