A、<img width="96" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/e46fb8fe-953b-4cd5-a24b-740d0b48ab17.png" />
B、<img width="95" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/2823fd32-b955-445f-b5cb-afe4a49b840c.png" />
C、<img width="115" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/5dd09238-cbd3-4082-8171-021a07c002f7.png" />
D、<img width="98" height="38" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dc5f683c-b05a-4009-80b5-dbb45d793868.png" />
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图5-5-16