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旋挖泥浆护壁成孔灌注桩成孔的护筒，其内径应比钻头外径大（）mm。

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旋挖泥浆护壁成孔灌注桩成孔的护筒，其内径应比钻头外径大（）mm。

A.100；

B.150；

C.200；

D.250；

参考答案:

答案：200；

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