Umehluko Phakathi Kwama-Cement Retainers nama-Bridge Plugs
Ukubhola Nokugaya Indlela Engcono Kakhulu: Uma isimo siwukwenza umsebenzi wokubhola noma wokugaya (udoti), umkhuba onconyiwe umi kanje: Sebenzisa i-tricone Bit(IADC Bit Codes 2-1, 2-2, 2-3, 2- 4, no-3-1) - ukwakheka okuqinile okuphakathi. I-PDC Bit ayiyona...
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