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【单选题】
下列方程组中，属于二元一次方程组的是（ ）A.
x+ y 3 =1 y= x 2
B.
3x-y=5 2y-z=6
C.
x 5 + x 2 =1 xy-1=0
D.
x-3=0 y-2x=6
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