2 |
A.(1,0,0)和(-1,0,0) | B.(2,0,0)和(-2,0,0) | ||||||||||||
C.(
| D.(-
|
2 |
x2+2+9 |
x2+1+1 |
A.(1,2,3) | B.(-1,-2,-3) | C.(1,-2,-3) | D.(-1,2,3) |
A.(-3,2,1) | B.(3,2,-1) | C.(-3,-2,-1) | D.(3,-2,1) |
A.x22+y32+z12=0 | B.x12+y22+z32=0 |
C.x32+y12+z22=0 | D.以上结论都不对 |
BC |
A.(0,4,2) | B.(0,-4,-2) | C.(0,4,0) | D.(2,0,-2) |
© 2017-2019 超级试练试题库,All Rights Reserved.