用标准齿条刀具加工正变位渐开线直齿圆柱外齿轮时，刀具的中线与齿轮的分度圆（）。
A.相切；
B.相割；
C.相离
参考答案：C
Although Wang Baoqiang has become famous, people still find him easy to _____. [ ]
A. get along
B. get on
C. get away with
D. get along with
关于我国实施人工辅助生殖技术的伦理原则，错误的是
A．知情同意原则
B．严防商品化原则
C．维护社会公益原则
D．互盲和保密原则
E．维护供方和后代利益原则
