1, carbide ngwá ọrụ ịgbado ọkụ. Dị ka izere ngwaọrụ,-egwe ọka auger ọkụ Rolling, ngwa mkpaji, hama, napụtara, waya egbutusị, wdg 2. Diamond ngwá ọrụ isi ịgbado ọkụ, dị ka diamond mma nkwọ ịgbado ọkụ, abrasive ngwaọrụ, sawtooth ịgbado ọkụ. 3. ịgbado ọkụ nke na-egwu ala ibe n'ibe na-eji maka prospecting, dị ka okwu bit na mboanuohia b ...
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