Then in chapter 3, the multilevel assessment system of residual strength of corrosion pipeline is introduced on the base of API579 and double shearing yield strength principles.

然后在第三章主要基于API 579准则，以双剪屈服条件为基础，进行了油气长输腐蚀管道剩余强度分级评价技术的叙述。

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The unit is composed of hydraulic and double conic placing, hydraulic spading and drawing, straightening, shearing, end stopping, coiling, feeding, dropping cart, ect.

本机组有液压，双锥放料，液压铲头引头，送料，校直，剪切，阻尼，收卷，上料，下料小车等主要部件组成。

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This paper deals with the natural convection temperature field of unlimited heated Plate with schlieren shearing interferometry of double frequency gratings.

用双频光栅纹影剪切干涉法对无限热平板的自然对流温度场进行诊断。

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