2 |
x2 |
2 |
OP |
OQ |
AB |
2 |
x2 |
2 |
2 |
1 |
2 |
2 |
1 |
2 |
| ||
2 |
| ||
2 |
| ||
2 |
| ||
2 |
OP |
OQ |
4
| ||
1+2k2 |
2 |
2 |
AB |
2 |
OP |
OQ |
AB |
2 |
| ||
2 |
| ||
2 |
| ||
2 |
A.0个 | B.1个 | C.2个 | D.3个 |
A.36条 | B.33条 | C.21条 | D.18条 |
A.若A∈a,A∈β,B∈a,B∈β,则a⊂β |
B.若A∈α,A∈β,B∈α,B∈β,则α∩β=直线AB |
C.若l⊄α,A∈l,则A∉α |
D.a∩b=Φ,a不平行于b,则a、b为异面直线 |
A.四点中必有三点共线 |
B.四点中必有三点不共线 |
C.AB、BC、CD、DA中总有两条平行 |
D.AB与CD必相交 |
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