3 |
A.30° | B.45° | C.60° | D.120° |
3 |
| ||
1-0 |
3 |
3 |
3 |
A.[0°,30°] | B.[150°,180°) |
C.[0°,30°]∪[150°,180°) | D.[30°,150°] |
A.45°,1 | B.135°,-1 |
C.90°,不存在 | D.180°,不存在 |
A.ab>0,bc<0 | B.ab<0,bc>0 | C.ab>0,bc>0 | D.ab<0,bc<0 |
A.mn>0,np>0 | B.mn<0,np<0 | C.mn>0,np<0 | D.mn<0,np>0 |
3 |
A.30° | B.150° |
C.120° | D.与a取值有关 |
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