In this country, the erectable rectangularsegment has not been adopted, with its relevant theory of design or calculation falling short of soundness.
矩形拼装式管片在我国还没有采用，相关设计计算理论也不完善。
2
A recursive algorithm is proposed for generating optimally unconstrained two-dimensional two-segment cutting patterns of rectangular blanks.
提出一种递归算法生成矩形毛坯两维两段排样方式。
3
The stock sheet is diveded into two segments by the algorithm. Each segment consists of strips with the same length and the direction. Rectangular blanks of different sizes appear in one strip.