无架空地线的单回线路的零序阻抗比有架空底线的单回线路要小。
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PEMFC结构主要由哪些部分组成?并简述其工作原理。
Which was once the central palace in Korea?
A. Changdeokgung (昌德宫)
B. Sungyemun(崇礼门)
C. Kwan HanRu (广寒楼)
D. Gyeongbokgung Palace (景福宫)
Which is the famous shopping center ?
A. Myeongdong (明洞)
B. Seoul Tower
C. 63 Building
D. Sunguyemun(崇礼门)