a |
b |
a |
0 |
b |
0 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
b |
a |
a |
b |
b |
c |
a |
c |
A.1 | B.2 | C.3 | D.4 |
a |
b |
a |
b |
a |
0 |
b |
0 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
b |
a |
b |
0 |
a |
b |
c |
b |
a |
c |
A.若a⊥β,则α⊥β |
B.若a∥c,b∥d,则α∥β |
C.若a⊥c,b⊥d,则α⊥β |
D.若α⊥r,β⊥r,α∩β=l,则l⊥r |
A.若x≠0,则x+
| ||
B.直线a,b为异面直线的充要条件是直线a,b不相交 | ||
C.“a=1是“直线x-ay=0与直线x+ay=0互相垂直”的充要条件 | ||
D.若命题p:”∃x∈R,x2-x-1>0”,则命题p的否定为:”∀x∈R,x2-x-1≤0” |
|
1 |
8 |
1 |
8 |
1 |
3 |
1 |
4 |
A.①②③ | B.②④⑤ | C.①③④ | D.①②③④⑤ |
1 |
2 |
1 |
2 |
3 |
4 |
3 |
4 |
1 |
2 |
5 |
4 |
A.一个 | B.二个 | C.三个 | D.四个 |
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