A.8m B.10m C.12m D.5m
A.8m B.10m C.12m D.15m
(A)決定桿塔承受的水平荷載的檔距 (B)決定桿塔承受風(fēng)壓的檔距 (C)決定桿塔承受導(dǎo)、地線自重、冰重的檔距