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【单选题】
下列方程组不是三元一次方程组的是（ ）A.
x+y=1 2y+z=-2 3y=6
B.
x 2 -4=0 y+1=x xy-z=-3
C.
x=2 2y=-3 x-z=1
D.
y-x=-1 x+z=3 2y-z=0
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