A、<img width="49" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/039518f9-924f-4030-8c37-45e8ef336db4.png" />(←)
B、<img width="89" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/812c26d8-8a4b-4e80-b0ed-3be350369857.png" />(←)
C、<img width="27" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/6fe2b2a6-5fdb-4e37-a862-274a2203c4ea.png" />(←)
D、以上值都不是
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