Rock bolts bụ ndoro ndoro nke nwere ike ịgbanwe na ịgwuo n'okpuru azu na ndoro nke ndoro n'ime ụlọ ọrụ geotechnical na engineering nke ndoro nke ọzọ na geotechnical. Ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro ndoro
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