短語詞組短語coring cone bit 牙輪取心鑽頭coring g bit 取芯鑽頭PDC non coring drill bit PDC 無心鑽頭hard metal coring bit 硬質(zhì)郃金取心鑽頭coring bit with diamonds 金剛石巖心鑽頭non -coring bit 不取心金剛石鑽頭percussive coring bit 沖擊鑽探取心鑽頭coring bit breaker 取心鑽頭裝卸器reverse circulation coring bit 反循環(huán)取心鑽頭 返回 coring bit