Which of the following statement is true about the normal lines of projection plane（）
A. Only perpendicular to one projection plane
B. Parallel to two projection planes
C. Only parallel to one projection plane
D. Inclined to a projection plane
查看答案
What drawing is obtained based on orthographic projection method（）
A. Three principal views
B. Isometric drawing
Cartographical drawin
D. Perspective drawing
E. Cabinet drawing
What drawing is produced based on parallel projection method（）
A. Multi-view projection
B. Isometric drawing
Cabinet drawing
D. Cartographical projection
E. Perspective projection
The space point is represented by（）
A. Capital letter
B. Lowercase letter
C. Small letter
D. Number
What kind of line type can be used to show projection lines（）
A. Thin continuous line
B. Thick continuous line
C. Thin hidden line
D. Thin centerline
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