In this country, the erectable rectangular segment 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。
In this country, the erectable rectangular segment 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。
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