在线播放国产精品三级网,亚洲性色av私人影院无码,国产日产人妻精品精品,中文字幕无码高清晰,阿拉伯少妇野外屁眼激情内射

        Energy saving, light weight, high strength, corrosion principle of material mechanics Convex concave corrugated structure, improve the mechanical strength, decrease the thickness of the steel plate used, reduce weight to surpass the cooling performance, to achieve energy saving design the structure of the upper and lower cold and hot air exchange, combined with the overall radiating surface increases, a greater extent make on bridge in the heat generated by the cable conductor is fully distributed, reduces the power loss in the line resistance and, improve the utilization rate of power to achieve the effect of energy saving. Energy saving tray compared with ordinary tray, power saving rate of 2.05%, compared with the ordinary ladder, power saving rate is 0.95%.