- safety arch
- 安全: safe; secure; safety; securi ...
- 拱架: bow member; lagging jack; ar ...
- 安全拱: safety arch
- 安全拱 分载拱 辅助拱: safetyarch
- 拱架: bow member; lagging jack; arch centering; arch centre; coom◇拱架吊钩 arch hook; 拱架集材 arch logging; 拱架柱 truch column
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