單項選擇題通信管道在人行道下的埋設(shè)深度(路面至管頂)為:()

A.水泥管、塑料管為0.7m,鋼管為0.5m
B.水泥管、鋼管為0.5m,塑料管為0.7m
C.塑料管、鋼管為0.5m,水泥管為0.7m
D.鋼管為0.5m,水泥管為0.6m,塑料管為0.7m


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