i i-beam idler gear惰轮齿
I-beam axle前轴工字梁
I-beam recommended工字钢;推荐用工字钢
i-shaped beam工形截面梁
I-beam mill工字钢轧机
I-shape beam工字梁
I-beam girder工字钢梁
Welded I-beam焊接工字梁
wood i-beam工字木梁
N(名词) a rolled steel joist or a girder with a cross section in the form of a capital letter I 工字梁 → compare H-beam