The distinguishing features of the paper are selection of oblique strip and loading transmission, negative yielding line in irregular slab with simple supports, point support and shear split of slab.
If two red strips appear, it turns out that the result is positive, if only one strip appears then the result is negative.
如果试纸条上出现两条红色条带则证明结果为阳性，如果只出现一条红色条带则结果为阴性。
3
The discussion involves such aspects as the cause of strip folding occurring in butt-welding process of spiral weld pipe, negative influence by such failure on pipe quality and preventive actions.