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High school mathematics vector. I just asked what happened to BCD.
B wrong!

The vectors E 1 and E2 are * * * planes, and any vector in the space is not necessarily with E 1 and E2 * * * planes;

C is wrong!

Must be in the plane, because this is the basic theorem of * * * surface;

D is wrong!

From * * * to the basic theorem of quantity, the two components of abundance are a set of unique numbers;