Suppose the least distance fron poinrs of the xurve(曲线)
to the y-axis is 
then the velue of a is
A． |
B． |
C．or |
D．or |
推荐套卷
Suppose the least distance fron poinrs of the xurve(曲线)to the y-axis is then the velue of a is
| A． |
B． |
C．or |
D．or |
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