待解决 悬赏分:1 - 离问题结束还有 后续研究过程中可能遇到的困难、问题,以及解决的途径问题补充:匿名 2013-05-23 12:21:38 Difficulties that may be encountered during the follow-up study , problems, and ways to solve 匿名 2013-05-23 12:23:18 Follow-up study difficulties might be encounte...