铣削锥齿轮，若工件装夹后轴线与分度头轴线不重合，会引起（）。
A.齿面粗糙度值过大
B.齿厚尺寸超差
C.齿圈径向圆跳动超差
D.齿距超差
参考答案：C
____, the more expensive the camera, the better its quality.
A．General speaking
B．Speaking general
C．Generally speaking
D．Speaking generally
In the reading room, we found her ______ at a desk, with her attentionon _____ a book.[ ]
A. sitting; fixing
B. to sit; fixed
C. seating; fixing
D. seated; fixed
