A、<img width="100" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/e68245a6-0cc8-40b0-bf18-9f497ed368af.png" />
B、<img width="109" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/8539c4bc-842b-4500-869c-e63d215c5ce7.png" />
C、<img width="119" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/2b09e6f1-e708-45b4-89db-868cb155486f.png" />
D、<img width="111" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/16594911-dec7-4c05-bb0c-ea52419155bb.png" />
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图1-2-16