车削外圆是由工件的（）和车刀作纵向移动完成的。
A．纵向移动
B．横向移动
C．垂直移动
D．旋转运动
参考答案：D
人们总把“秦皇汉武”并称，他们二人在以下哪个问题上采取了相反的措施 [ ]
A．中央集权
B．经济发展
C．外族入侵
D．儒家学说
—It was the drug, not the disease, that killed the boy.
—He would be still alive today if he _____ that drug.[ ]
A. not take
B. shouldn't have taken
C. didn't take
D. hadn't taken
