joist pass
... joist搁栅、小梁、桁条、工字钢工字梁 joist pass工字钢孔型 joist（rolling）mill工字钢轧机 ...
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他对角钢孔型轧制的，工字钢轧制和U -型钢轧制等剧做过深入研究。
Roll pass on Angle steel rolling, I-beam rolling and U-section, etc. were intensively studied.
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