中文说明：29.1投影(第1课时)课件ppt甘肃省镇原县上肖中学九年级下
English Description：
29.1 projection (Lesson 1) courseware ppt grade 9, Shangxiao middle school, Zhenyuan County, Gansu Province
29.1 projection (Lesson 1) courseware ppt grade 9, Shangxiao middle school, Zhenyuan County, Gansu P
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中文说明：29.1投影(第1课时)课件ppt甘肃省镇原县上肖中学九年级下
English Description：
29.1 projection (Lesson 1) courseware ppt grade 9, Shangxiao middle school, Zhenyuan County, Gansu Provincezmj-4606-74909.rar