Similar folds have the same wave shape, but bed thickness changes throughout each layer, with thicker hinges and thinner limbs.

相似褶皱的各岩层有同样的波形，但每一层的厚度均有变化，枢纽处厚而翼部较薄。

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The flexure modulus test results shows, the flexure modulus of the middle layer group PMMA strengthening material has no obvious difference with the same thickness group (P>0.05);

弹性模量测试结果表明，中间层组的PMMA加强材料的弹性模量与相同厚度的对照组无显著差异（P＞0.05）；

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Generally, the same specifications, the wall thickness of the hot water, cold water layer is to manage the use of a need to make a distinction ;

一般而言，同一规格中，管壁较厚的是热水管，较薄的是冷水管，使用时必须分清楚；

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Generally, the same specifications, the wall thickness of the hot water, cold water layer is to manage the use of a need to make a distinction ;

一般而言，同一规格中，管壁较厚的是热水管，较薄的是冷水管，使用时必须分清楚；

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