Allowable misclosure for primary leveling的意思|示意
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一级调平的允许错误闭合
Allowable misclosure for primary leveling的网络常见释义
图根水准测量规定 ⑵图根水准测量规定(Allowable misclosure for primary leveling): 平原地区: f h允= ± 40 L mm ,L ??