A、<img width="36" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/6c2872f0-4e4b-480a-b7b9-df7b6929087f.png" />
B、<img width="47" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/88011cc3-0fff-4d55-b7c7-12796afdad13.png" />
C、<img width="36" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/1e9f486c-d67a-49ab-a4f7-46bb4dd6cafc.png" />
D、<img width="47" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/645a2232-e2e7-48be-96a6-144342d32d2b.png" />
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图1-2-6