a |
b |
a |
3 |
4 |
b |
a |
3 |
4 |
b |
A.垂直 | B.平行 | ||
C.夹角为
| D.不平行也不垂直 |
a |
3 |
4 |
b |
a |
3 |
4 |
b |
a |
9 |
16 |
b |
a |
3 |
4 |
b |
a |
3 |
4 |
b |
A.1 | B.2 | C.3 | D.4 |
i |
j |
i |
j |
a |
b |
a |
b |
a |
A.-2 | B.2 | C.-1 | D.-3 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.-6 | B.-3 | C.3 | D.6 |
e1 |
e2 |
a |
e1 |
e2 |
b |
e1 |
e2 |
a |
b |
A.-2 | B.2 | C.-
| D.
|
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