多选题:关于泥浆护壁成孔灌注桩说法正确的是(  )。

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题目内容:
关于泥浆护壁成孔灌注桩说法正确的是(  )。
A.制备泥浆应选用高塑性黏土和膨润土
B.应随时测定和控制泥浆浓度
C.施工期间护筒内泥浆应高于地下水位1.0m
D.废弃泥浆可直接排放,便于管理
E.护壁泥浆应单独制备
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