现场试验结果表明，PDC锚杆钻头是钻进中硬岩层的理想钻头。

The results of field tests proved that PDC anchor bit is ideal in mid hard rock drilling.

youdao

现场试验结果表明，PDC锚杆钻头是钻进中硬岩层的理想钻头。

The results of field tests proved that PDC anchor bit is ideal in mid hard rock drilling.

youdao