Read the words and expressions about eating.Find the items equivalent to those given in Chinese in the box
空间点A的侧面投影a"到OY轴的距离等于空间点A到
A. 投影面V的距离
B. 应为到投影面W的距离
C. 投影面H的距离
D. none
下列几组点中,哪一组是W面上的重影点,并且n"为可见?
A. 点M(5,10,8)和点N(10,10,8)
B. 点M(10,10,8)和点N(9,10,5)
C. 点M(10,30,-5)和点N(8,30,-5)
D. none