根据投射方向是否垂直于轴测投影面，轴测投影可分为正轴测投影和（）两类
A.正二测投影
B.正等测投影
C.斜二侧投影
D.斜轴测投影
参考答案：D
在训练成绩评定时，我们所说的两级制是指合格和不合格。（）
When a storm is just ________,we must fix up the roof to prevent it from________.[ ]
A. around the corner; blowing away
B. around the corner; being blown away
C. in the corner; blowing away
D. in the corner; being blown away
