What orientations can be shown on projection plane V（）
A. Right and left
B. Up and down
C. Front and rear
D. None
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What kind of line types are used to represent visible outlines（）
A. Continuous thick line
B. Continuous thin line
C. Thin hidden lines
D. Center line
Which of the following statements is true about oblique lines（）
A. Inclined to three projection planes
B. Parallel to two projection planes
C. Only inclined to two projection planes
D. Inclined to one projection plane
What orientations can be shown on projection plane W（）
A. Up and down
B. Front and rear
C. Left and right
D. None
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
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