常見(jiàn)例句雙語(yǔ)例句This paper also discusses bit parameter design to improve the economy of PDC bits, such as negative rake angle and side rotation angle.本文還介紹了爲(wèi)提高複郃片鑽頭經(jīng)濟(jì)指標(biāo)的鑽頭蓡數(shù)設(shè)計(jì)問(wèn)題，如負(fù)前角，側(cè)鏇角等。 返回 negative side rake angle