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Pre-bored pre-kayan aiki
Hanyoyin da suka gabata na pre-gundura don amfani da kayan aikin da aka riga aka gabatar don yin hakowa, zurfin motsawa da kuma fa?a?a jikin pile. Hanya ce ta tushe mai tarin abubuwa tare da nau'ikan nau'ikan nau'ikan nau'ikan karuwa na kwararar karfin gwiwa (PHC), kimanta karfin gwiwa mai karfi.
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