a |
b |
c |
a |
b |
c |
0 |
a |
b |
a |
b |
c |
A.1 | B.
| C.2 | D.
|
a |
b |
a |
b |
a |
b |
c |
a |
b |
a |
b |
(
|
|
1+4 |
5 |
a |
b |
a |
b |
A.互相平行 | B.互相垂直 | C.夹角为30° | D.夹角为60° |
BC |
CA |
AB |
c |
BC |
a |
CA |
b |
a |
b |
b |
c |
c |
a |
A.
| B.-
| C.
| D.-
|
AP |
BP |
PB |
PA |
PB |
PA |
PC |
AB |
CB |
CA |
A.直角三角形 | B.等边三角形 |
C.等腰直角三角形 | D.等腰三角形 |
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