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怎的得到这个页面的验证码地址

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Release： 2016-06-13 12:36:54
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怎样得到这个页面的验证码地址
http://sichuan.gp2012.teacher.com.cn/GuoPeiAdmin/CourseStudy/StudyfrmNew.aspx?StudyPlanBookID=196
页面如上，有一个悬浮小窗口，“更新学习时间”中有一个输入验证码的框，框内有“点此获取”字样，点击会在框后出现验证码，但查看不了验证码地址。
我想知道验证码图片的地址，请各位大侠帮忙！不胜感激！

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