OA |
a |
OB |
b |
OC |
c |
OD |
d |
A.
| B.
| C.
| D.
|
OA |
a |
OB |
b |
OC |
c |
OD |
d |
a |
b |
c |
d |
BA |
CD |
0 |
AB |
AC |
BC |
AB |
BC |
CA |
0 |
AB |
AC |
AB |
AC |
AC |
AB |
A.①② | B.①④ | C.②③ | D.②③④ |
A.若a∥b,则a与b的方向相同或相反 |
B.若a∥b,b∥c,则a∥c |
C.若两个单位向量互相平行,则这两个单位向量相等 |
D.若a=b,b=c,则a=c |
AB |
A.±(
| B.(-
| C.(
| D.(
|
a |
a |
b |
a |
c |
a |
e |
OA |
OB |
O |
AB |
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