單項選擇題鐵塔應(yīng)在特殊天氣災(zāi)害前后應(yīng)進(jìn)行應(yīng)急巡檢,當(dāng)鐵塔裹冰厚度大于()時,應(yīng)采取適當(dāng)?shù)某胧?/strong>

A.5mm
B.20mm
C.30mm
D.10mm


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