单项选择题
A.c1η1+c2η2,c1,c2任取 B. C.c1η1+c2(ζ1-ζ2)+ζ1,c1,c2任取 D.c1η1+c2η2+(ζ1+ζ2),c1,c2任取
A.(0,-1,0,2) B.(-1,0,1,0)和(2,0,-2,0) C.(-1,0,1,0)和(0,-1,0,2) D.(0,-1,0,2)和(0,,0,1)
A.2 B.-2 C.1 D.-1