A、<img width="42" height="35" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/158cc52e-cf13-4007-9e97-95f82584597c.png" />
B、<img width="44" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/86470906-8c98-4de2-b580-4e69e241a018.png" />
C、<img width="41" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/b78e10e9-35a6-45c4-ad60-88694e5b9540.png" />
D、<img width="41" height="35" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/50835e30-14c1-456f-a9a5-b5cab39f2597.png" />
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图5-4-8