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Mathematics (Liberal Arts) 19 Proof EBF Parallel Print Advertisement in 2007 National College Entrance Examination (National Volume II).
Yes,

The vertical plane can be deduced from the vertical plane.

Because the print EBF// print advertisement and EF belong to the print EBF but not to the print advertisement, EF is parallel to the print advertisement (SAD).

This is a theorem!

If two planes are parallel, then any straight line on this plane is parallel to the other plane.

I hope I can solve your problem!

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