沉井封底前自沉速率应小于()。A、10mm/8h B、15mm/8h C、20mm/8h D、25mm/8h

作者: rantiku 人气: - 评论: 0
问题 沉井封底前自沉速率应小于()。
选项 A、10mm/8h B、15mm/8h C、20mm/8h D、25mm/8h
答案 A
解析 新版教材P104,原文是2〉终沉时,每小时测一次,严格控制超沉,沉井封底前自沉速率应小于10mm/8h。

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