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Second chapter, crystal structure and X-beam test technology;
第二章，晶体结构与X射线测试技术；
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Test research on beam model.
模型梁试验研究。
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The site test on the prestressed frame beam was introduced.
介绍了现场进行的预应力框架梁测试。
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The site test on the prestressed frame beam was introduced.
介绍了现场进行的预应力框架梁测试。
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