题目内容
在平行投影中，根据投射线与投影面之间是否垂直，又分为（）和（）两种：投射线与投影面倾斜时称为（）；投射线与投影面垂直时称为（）。
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标高投影图是一种带有数字标记的多面正投影图，它用正投影法在物体的水平投影上加注某些特征线、面以及控制点的高程数值。
在一个三投影面体系中，两投影面的交线称为投影轴，H面与V面的交线为OX轴，H面与W面的交线为OY轴，V面与W面的交线为OZ轴，三条投影轴两两互相垂直并汇交于原点O。
Directions: Choose the best answer which has the closest meaning of the underlined word.It had been an abominable afternoon, culminating at about six o’clock in her father’s attempted suicide.
Directions: Choose the best answer which has the closest meaning of the underlined word.She cross-examined any guests who had pretensions to legal or medical knowledge.
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