问题
选择题
与直线2x-y+4=0的平行的抛物线y=x2的切线方程是[ ]
A.2x-y+3=0
B.2x-y-3=0
C.2x-y+1=0
D.2x-y-1=0
答案
答案：D
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与直线2x-y+4=0的平行的抛物线y=x2的切线方程是[ ]
A.2x-y+3=0
B.2x-y-3=0
C.2x-y+1=0
D.2x-y-1=0
答案：D