口语强化SAE花键标准简介ANSI B92.1-1970 SAE花键标准INVOLUTE SPLINES渐开线花键Form Circle is the circle which defines the deepest points of involute form control of the tooth profile. This circle along with the tooth tip
SAE花键标准简介ANSI B92.1-1970 SAE花键标准INVOLUTE SPLINES渐开线花键Form Circle is the circle which defines the deepest points of involute form control of the tooth profile. This circle along with the tooth tip circ
新概念英语第三册逐句精讲语言点 第39课 Nothing to worry aboutThe rough road across the plain soon became so bad that we tried to get Bruce to drive back to the village we had ugh[rʌf]adj.粗糙的;粗略的;粗野的;艰苦的;未经加