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桥梁桩基础钻孔方法中，采用（）可以保证成孔垂直度和孔位。 A.正循环回转钻孔 B.旋
桥梁桩基础钻孔方法中，采用（）可以保证成孔垂直度和孔位。
A.正循环回转钻孔
B.旋挖钻机钻孔
C.潜水钻机钻孔
D.冲抓钻孔
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