当前一些直缝焊管机组所配备的垂直进锯型飞锯因易造成切断端面严重变形，不适合锯切正位生产的方矩型类管材。
The vertical feed fly saw, equiped on most straight welding pipe sets, can not be suitable to cut square shaped pipes because of serious deformation on the cut face.
3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。
The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
如：不锈钢圆管、方管、矩管、压花管、螺纹管、镀铂金管等。
Such as: stainless steel pipe, square pipe, rectangular pipe, embossed pipe, threaded pipe, platinum-plated tube.
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