圆柱铣刀（）的主要作用是减小后刀面与切削平面之间的摩擦。
A.前角
B.后角
C.螺旋角
D.楔角
参考答案：D
—I didn't see you at the meeting.
—I had a bad cold. The doctor asked me _______ in bed. [ ]
A. staying
B. to stay
C. stayed
D. to staying
2016年是庆祝中 * * 党成立（）周年，也是纪念中国工农红军长征胜利（）周年。
A.96、80
B.95、80
C.90、85
D.95、85
