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【单选题】
下列对各类围堰的基本要求中正确的是( )。
A.
围堰高度不应高出施工期内可能出现的最高水位
B.
当基坑为渗水的土质时,坑底尺寸应根据排水要求和基础模板设计所需基坑大小而定,一般基底应比基础的平面尺寸增宽1.5~2.0m
C.
围堰外形设计时应考虑水深及河底断面被压缩后,流速增大而引起水流对围堰、河床的集中冲刷及航道影响等因素
D.
围堰结构和断面应满足堰身弯度、稳定和防水要求
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