根据如图所示AB、CD直线和P、Q平面,选择回答如下题: (5.) P、Q平面的水平投影应标记为( )。 A. p’、q’ B. p、q C. p”、q” D. P、Q
A.
选择A
B.
选择B
C.
选择C
D.
选择D
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