A、<img width="67" height="38" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/c2b3b097-e7fa-4740-b757-d7bd14ca921c.png" />
B、<img width="75" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/e41b5e65-06bf-4616-9705-2e7a3d8f79b3.png" />
C、<img width="68" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/e6167d81-1a06-4e06-80a3-ac8e562f09f5.png" />
D、<img width="73" height="35" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/e8e47109-d80b-493c-9c56-a25560003762.png" />
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图7-2-17