直齿轮的特点是轮齿的齿顶线与轴的中心线方向是平行的，可翻译为：The addendum line of spur gear　is parallel to that of shaft centerline, which is the dominant feature of spur gear.

直齿轮的特点是轮齿的齿顶线与轴的中心线方向是平行的，可翻译为：The addendum line of spur gear　is parallel to that of shaft centerline, which is the dominant feature of spur gear.
A.正确
B.错误
正确答案：正确