
A.(2,0,0)
B.(1,1,-1)
C.(1,0,-1)
D.(0,0,0)
[单选题]A.(2,0,0)B.(1,1,-1)C.(1,0,-1)D.(0,0,0)
[单选题]A.(2,0,0)B.(1,1,-1)C.(1,0,-1)D.(0,0,0)
[单选题]A.(2,0,0)B.(1,1,-1)C.(1,0,-1)D.(0,0,0)
[单选题]A.(2,0,0)B.(1,1,-1)C.(1,0,-1)D.(0,0,0)
[单选题]A.(2,0,0)B.(1,1,-1)C.(1,0,-1)D.(0,0,0)