A、<img width="49" height="33" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/537a93e6-e10e-492d-b15c-7ba3e7d59d8b.png" />
B、<img width="49" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/194550a0-869e-47e1-8b0a-dc060ef79395.png" />
C、<img width="53" height="25" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/a9c24864-fa9d-4689-bb70-ef822268b390.png" />
D、<img width="47" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/975238d1-8d79-47b5-8b9a-6ae447f3c5a7.png" />
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图5-4-7