a |
2 |
3 |
a |
a |
2 |
3 |
a |
2 |
3 |
a |
12 |
3 |
2 |
3 |
a |
10 |
3 |
a |
10 |
3 |
a |
i |
j |
i |
j |
i |
j |
i |
j |
A.0个 | B.1个 | C.2个 | D.3个 |
a |
b |
1 |
2 |
x |
b |
a |
3 |
4 |
b |
x |
A.4
| B.4
| C.
| D.
|
a |
b |
a |
b |
a |
b |
b |
a |
1 |
2 |
b |
1 |
2 |
a |
b |
A.长度相等的两个非零向量相等 |
B.平行向量一定在同一直线上 |
C.与零向量相等的向量必定是零向量 |
D.任意两个相等的非零向量的始点与终点是一平行四边形的四顶点 |
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