单项选择题
A.断路器; B.1T1开关; C.10kV开关; D.10kV三水线
A.2.7m; B.2.8m; C.2.9m; D.3m
A.5; B.10; C.15; D.20
A.100mm; B.150mm; C.200mm; D.300mm
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