单项选择题
台架接地网为闭合环形,坑深不应小于(),坑宽()。
A.800mm;400mm
B.400mm;800mm
C.400mm;400mm
D.800mm;600mm
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单项选择题
A.800mm;400mm
B.400mm;800mm
C.400mm;400mm
D.800mm;600mm
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