A.耐腐蝕塑料墊塊 B.高強(qiáng)度砂漿墊塊 C.不低于梁體強(qiáng)度混凝土墊塊 D.高強(qiáng)度石塊
A.30mm和50m B.15mm的20mm C.50mm和30m D.20mm和l5mm