1) change in section
断面变化
2) sectional shape
断面形状变化
1.
It is studied by experiment that the influence factors and influence laws on variations of wall thickness and sectional shape during square tube dieless drawing.
试验研究了方管材无模拉伸时壁厚变化及断面形状变化的影响因素及影响规律。
3) variation of cross section of riverbed
河床断面变化
4) step change in wall thickness
壁厚阶跃变化，断面变化
5) section distortion
断面畸变
1.
Control method of the section distortion of steel pipe in hot bending;
钢制热弯弯管断面畸变的控制方法
6) the double changes the cross section
双变断面
补充资料：异形断面钢材(见异形断面型材)
异形断面钢材(见异形断面型材)
special section steel
，一、u以uu、’“飞豆on gQngC01异形断面钢材(speeial Seetion steel)见异形断面型材。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条