评定航道整治建筑物安全稳定性实质上是灰色系统问题。
So the evaluation on safety and stability of regulating structures in a channel is a grey system theory problem.
研究含缺陷弯头的塑性承载能力在整个压力管道系统安全评定中占有重要地位。
So it is very important to know the effect of cracks on the collapse loads of elbows for integrity assessment of the piping system.
焊接缺陷是工业管道系统中最常见的缺陷，而管道系统中由于焊接缺陷引起的事故屡屡发生，因此管道焊接缺陷评定对于管道的安全运行具有重要意义。
As the most common flaws in industrial piping systems, weld flaws frequently lead to accidents. Therefore, assessment of piping with weld flaws is of great significance.
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