涵洞拱圈砌筑砂浆或混凝土强度达到设计强度的()时,方可拆除拱架,达到设计强度后,方可回填土。A、75% B、80% C、85% D、90%

作者: rantiku 人气: - 评论: 0
问题 涵洞拱圈砌筑砂浆或混凝土强度达到设计强度的()时,方可拆除拱架,达到设计强度后,方可回填土。
选项 A、75% B、80% C、85% D、90%
答案 C
解析 新版教材P146 拱圈砌筑砂浆或混凝土强度达到设计强度的85%时,方可拆除拱架,达到设计强度后,方可回填土。

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