按用途工艺基准可分为（）。
A.定位基准
B.测量基准
C.工序基准
D.装配基准
参考答案：A, B, C, D
It snowed _____ this February. Many people had to stay at home instead of going travelling. [ ]
A. heavily
B. quickly
C. slowly
D. weakly
母线长为1的圆锥的体积最大时，它的高等于（ ）
