What kind of line types are used to represent invisible outlines（）
A. Thin hidden line
B. Continuous thick line
Continuous thin line
D. Thin centerline
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In plane figure, what kind of line type is used to show the symmetric line（）
A. Thin centerline
B. Thick hidden line
C. Thin phantom line
D. Thin break line
What orientations can be shown on projection plane H（）
A. Right and left
B. Front and rear
C. Up and down
D. None
Which of the following statements is true about the inclined lines（）
A. Only parallel to one projection plane
B. Only inclined to two projection planes
C. Perpendicular to one projection plane
D. Inclined to one projection plane
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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