A、<img width="139" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/de6a351d-5730-421f-bb7d-cbf31a9170be.png" />
B、<img width="259" height="87" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/f9c893e3-5963-4910-9355-351f9aad76b3.png" />
C、<img width="152" height="45" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/8498c0ac-cd32-4c82-af96-3e5714d27b77.png" />
D、<img width="154" height="45" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/0afc10c5-f058-4143-9e1b-25ebba8df7a4.png" />
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图5-4-6