Ngwa 1. A na-eji ezé e gwupụta ihe na akụrụngwa dịka ndị na-egwupụta ihe na ndị na-ebu ibu iji gwuo ala, ọla na nkume.2. N'elu ígwè ọrụ dị ka ndị na-akụpịa ihe na hydraulic hammers, a na-eji ezé na-egwupụta ihe na-egwupụta ihe na-akụpịa nnukwu nkume ma ọ bụ ọla maka nhazi ọzọ.3. A na-ejikarị ezé gwupụta ihe na igwe na-egwupụta ihe na ihe ndị na-ebufe ihe na-anakọta ma bufee ọla.4. Ụfọdụ ezé ngwuputa ihe dị mma maka akụrụngwa mkpọpu ihe ejiri na-agbawa agbawa ma ọ bụ geological exp...
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