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Two lines are parallel in space provided that their respective projections on two projection planes are parallel.
Two lines are parallel in space provided that their respective projections on two projection planes are parallel.
A.正确
B.错误
正确答案：正确
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The true length projection of a line appears in a projection plane that is parallel to the line。
下一条：
If a line is parallel to any line in a plane， the line is parallel to the plane.