A、<img width="48" height="48" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/dc7ceaee-1ff2-4d46-885b-5eed5ad0c465.png" />收敛
B、<img width="132" height="52" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/d267b203-3a1e-4218-9797-cb869730aa5d.png" />
C、<img width="56" height="48" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/f507ed7c-8dde-4f65-843a-c0deb76353a1.png" />发散
D、<img width="59" height="51" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/00dbcf25-a048-48e4-9336-ad62e97ebdad.png" />发散
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