A. 齿顶圆、齿根圆、节圆 B. 齿顶圆、齿根圆、分度圆、基圆 C. 齿顶圆、基圆、节圆、齿根圆 D. 齿顶圆、分度圆、节圆、齿根圆、基圆
A. two B. three C. more than two D. more than three
A. 正确 B. 错误