1、破拱结构
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2、缺口拱
...缺口脆性试验 notch brittleness test缺口拱 broken arch缺口环 landolsring ...
broken line arch折线拱
reinforced broken rock arch锚固组合拱
We Saw Broken Arch又见到断拱
Broken arch structure破拱结构
arch broken methods coventionally破拱方法