
A.(0,0,1/2)
B.(0,0,1/4)
C.(0,0,2/3)
D.(0,0,3/4)
[单选题]A.(0,0,1/2)B.(0,0,1/4)C.(0,0,2/3)D.(0,0,3/4)
[单选题]A.(0,0,1/2)B.(0,0,1/4)C.(0,0,2/3)D.(0,0,3/4)
[单选题]A.(0,0,1/2)B.(0,0,1/4)C.(0,0,2/3)D.(0,0,3/4)
[单选题]A.(0,0,1/2)B.(0,0,1/4)C.(0,0,2/3)D.(0,0,3/4)
[单选题]A.(0,0,1/2)B.(0,0,1/4)C.(0,0,2/3)D.(0,0,3/4)
[单选题]A.(0,0,1/2)B.(0,0,1/4)C.(0,0,2/3)D.(0,0,3/4)
[单选题]A.(0,0,1/2)B.(0,0,1/4)C.(0,0,2/3)D.(0,0,3/4)
[单选题]A.不变B.扩大2倍C.扩大4倍D.缩小一半E.缩小为原来的1/4
[单选题]A.a任意,b=0B.a任意,b=-1C.D.
[单选题]A.不变B.扩大2倍C.扩大4倍D.缩小一半E.缩小为原来的1/4