The mechanical principle and the manufacture of the steel barrel type barer, and its operation in the substation ground network construction have been introduced.
介绍了钢管式钻具的制作、构造原理，以及在变电所接地网敷设中的应用情况。
The mechanical principle and the manufacture of the steel barrel type barer, and its operation in the substation ground network construction have been introduced.
介绍了钢管式钻具的制作、构造原理，以及在变电所接地网敷设中的应用情况。
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