矩形管其實(shí)是由于其橫截面是方形而命名的,從外形來(lái)說(shuō)方管與圓管最顯而易見(jiàn)的區(qū)別就是其橫斷面,方管是方形的圓管是圓形的。其中方管是屬于異形管。In fact, the square tube is named because the cross section is square. From the shape, the most obvious difference between the square tube and the circular