a |
b |
a |
b |
A.
| B.
| C.
| D.4 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
7 |
a |
b |
a |
b |
A.-
| B.
| C.-
| D.
|
AB |
a |
BC |
b |
AC |
c |
a |
b |
c |
a |
b |
a |
c |
b |
c |
π |
3 |
a |
b |
c |
a |
b |
c |
a |
b |
c |
0 |
a |
b |
c |
a |
b |
A.若a•b=0,则|a|=0,或|b|=0 | ||||
B.若|a|=|b|,则向量a与向量b是相等向量或相反向量 | ||||
C.向量
| ||||
D.若向量a,b共线,则a•b=|a 题型:b| |
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