方形钢材的重量怎么换算平方？
这样的钢材要怎么换算啊？求高手解答。
[flash=480,400,0]http://pic.51fangfu.com/video/20180615/1529058476464466_478.mp4[/flash]
[flash=480,400,0]http://pic.51fangfu.com/video/20180615/1529058579245647_991.mp4[/flash]
[flash=480,400,0]http://pic.51fangfu.com/video/20180615/1529058476464466_478.mp4[/flash]
[flash=480,400,0]http://pic.51fangfu.com/video/20180615/1529058579245647_991.mp4[/flash]
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