a |
b |
a |
b |
c |
a |
c |
b |
c |
c |
A.2 | B.1 | C.
| D.4 |
a |
b |
a |
b |
c |
a |
c |
b |
c |
a |
b |
c |
c |
c |
A.(a+b)⊥(a-b) |
B.a与b的夹角等于α-β |
C.|a+b|+|a-b|>2 |
D.a与b在a+b方向上的投影相等 |
a |
b |
a |
b |
π |
2 |
AP |
BC |
A.8 | B.6 | C.4 | D.2 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.3 | B.4 | C.5 | D.6 |
OA |
OB |
OC |
OA |
OB |
A.2 | B.0 | C.1 | D.-2 |
© 2017-2019 超级试练试题库,All Rights Reserved.