The utility model discloses a safety arch centering, which is mainly used for a support for covering an agricultural film.
本实用新型公开的安全拱架，主要用于覆盖农膜时的支撑物。
The article proposes to clear away the earth and stones covering the two springs of arch of the bridge and then survey and determine with accuracy its clear span.
该文建议挖开掩盖赵州桥拱脚的石块和泥土，找到两拱脚，精确测定净跨径。
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