这就改变了过去单一采用型钢焊接和组装电缆桥架的落后局面。
The furnace body is welded by profile steel and plates and the studio in the furnace shell is made of hi-temp mullite.炉体是采用型钢、板材焊接而成的炉壳,炉壳内的工作室采用高温莫来石砌筑成型。
In roadway support, bolt support saves cost of support over profile steel, economic performance is distinctly improved.锚杆支护在煤巷支护方面,较型钢支护程度不同地节约了支护费用,经济效益明显提高。