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http://www.wsbookshow.com/uploads/bookfile/201410/9787517023548_1.pdf
http://www.3dwoo.com/showBookDetail.asp?nb=41196
http://www.ccf.org.cn/resources/1190201776262/digital/cnccpdf/chenguoliang2011-12-12-10_03_14.pdf
http://mooc1.chaoxing.com/nodedetailcontroller/visitnodedetail?courseId=&knowledgeId=81787331
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http://www.bauhinia.org/index.php/zh-HK/analyses/391
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