a |
b |
c |
a |
b |
c |
A.1 | B.-1 | C.0 | D.±1 |
a |
b |
c |
c |
a |
b |
|
1 |
2 |
1 |
2 |
a |
b |
a |
b |
a |
b |
a |
4 |
3 |
b |
A.②③ | B.①④ | C.①②④ | D.①②③④ |
i |
j |
k |
a |
i |
j |
k |
b |
i |
j |
k |
c |
i |
j |
n |
a |
A.若l⊥α,则
| B.若l∥α,则
| ||||||||
C.若
| D.若
|
a |
b |
A.x=6,y=15 | B.x=3,y=
| C.x=3,y=15 | D.x=6,y=
|
AB |
a |
AC |
b |
AA′ |
c |
AM |
AC′ |
BN |
BC |
MN |
a |
c |
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