A、1/n
B、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dec6ab31-2318-4cba-851f-e036171f5356.jpg" width="37" height="24" />
C、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/0855b70a-25b6-42e7-88a6-64b3bc781fda.jpg" width="36" height="38" />
D、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/e5d9915f-8c28-4b5f-b4bb-edb914622f88.jpg" width="36" height="35" />
B、<img src='/s/tiw/p3/UpLoadImage/2013-05-07/dec6ab31-2318-4cba-851f-e036171f5356.jpg' width='37' height='24'>
C、<img src='/s/tiw/p3/UpLoadImage/2013-05-07/0855b70a-25b6-42e7-88a6-64b3bc781fda.jpg' width='36' height='38'>
D、<img src='/s/tiw/p3/UpLoadImage/2013-05-07/e5d9915f-8c28-4b5f-b4bb-edb914622f88.jpg' width='36' height='35'>
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