A.普通螺紋 B.英制螺紋 C.梯形螺紋 D.鋸齒螺紋
A.長(zhǎng)對(duì)正 B.高平齊 C.寬相等 D.上邊對(duì)齊
A.長(zhǎng)對(duì)正 B.高平齊 C.寬相等 D.前邊對(duì)齊