单选题:如果此回路是系统联络线,采用LW12-220 SF6单断口瓷柱式断路器,请计算瓷套对地爬电距离和断口问爬电距离不低于哪项

题目内容:
如果此回路是系统联络线,采用LW12-220 SF6单断口瓷柱式断路器,请计算瓷套对地爬电距离和断口问爬电距离不低于哪项?(  ) A.500cm,500cm
B.630cm,630cm
C.630cm,756cm
D.756cm,756cm

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