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.
主tpy - 30型钻机是一种液压浅孔物探普查钻孔机，该机主要适用于土层，沙土层和中硬岩层中的钻进。
TPY-30 drilling machine is a type of shallow-hole drilling machine for exploration, it is suitable for drilling in soil, sand soil and medium harden rock drilling.
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