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20 15 Mathematics Examination Paper of the Second College Entrance Examination in Hedong District: Seeking the Answer
Positive solution:
1、C
M={y|y≥ 1}
N = {x | x ≥ 1 or x ≤- 1}
m？ ordinary
So choose C.
2、B
Theorem 2 for judging plane parallelism;
If two intersecting lines in one plane are parallel to the other plane, the two planes are parallel.