Rotary Drilling Rig, nke a makwaara dị ka piling rig, bụ ihe ọkụkụ zuru oke nke enwere ike iji mee ihe dị iche iche nke nwere oghere ngwa ngwa na-eme ọsọ ọsọ, obere mmetọ na nnukwu njem.Enwere ike iji obere auger dị mkpụmkpụ maka igwu ala akọrọ, a pụkwara iji rotary bit maka igwu mmiri na ...
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