It is connected to the required position of drilling stem to protect drilling stem without any influence on the normal working of drilling tool.
将它连接于所用钻柱的需要部位，保护钻柱、不影响钻具正常工作。
It is connected to the required position of drilling stem to protect drilling stem without any influence on the normal working of drilling tool.
将它连接于所用钻柱的需要部位，保护钻柱、不影响钻具正常工作。
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