A、<img width="70" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/32659209-bc93-495f-83d0-63d732ce1db3.png" />
B、<img width="45" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/2a8877a6-fcc2-4cbd-8685-9e38c189ed8f.png" />
C、<img width="57" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/738fb7ab-d0e1-479b-bcef-248470dbd769.png" />
D、<img width="67" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/5f72df3e-227b-46b6-a364-7699925541bd.png" />
查看答案
的斜渐近线方程为（ ）。