In the center of the navigation control is a circle that you can click to place the cursor at the required position in the screen.
导航控件中央是一个圆，您可以单击它，以将光标放在屏幕上所需的位置。
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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