A、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/fa0b6447-0199-44a1-9de9-51d2652a5233.png" width="19" height="21" />±SD
B、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/fa0b6447-0199-44a1-9de9-51d2652a5233.png" width="19" height="21" />±2SD
C、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/fa0b6447-0199-44a1-9de9-51d2652a5233.png" width="19" height="21" />±3SD
D、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/fa0b6447-0199-44a1-9de9-51d2652a5233.png" width="19" height="21" />±4SD
E、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/fa0b6447-0199-44a1-9de9-51d2652a5233.png" width="19" height="21" />±5SD
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