gradeline
... 巷道碎部测量 detail survey of workings 巷道腰线 grade line 巷道支架 sill ...
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在误差允许范围内,采用简易方法自行延长巷道中腰线,以减少施工影响。
Within the error rang allowed, adopt simple and easy method to automatically prolong middle line of tunnel in order to reduce the influence to construction.
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