题目内容

The visible outline should be drew in

A. thick continuous line
B. Dashed line
C. Ddoubble dashed-dotted line
D. Zig-zag line

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If the cutting plane of a cone paasing through the vertest, the intersection line should be

A. a triangle
B. rectangle
C. circle
D. ellipse

Which one is not a basic solid

A. belcony
B. cylinder
C. cone
D. sphere

If the cutting plane of a cone passing through the vertest, the intersection line should be a

A. triangle
B. rectangle
C. circle
D. ellipse

The relasionship of the axis and element on the sylinder is

A. Parallel
B. Intersect
C. Screw
D. virtical