中文说明：29.1投影（第二课时）课件ppt新课标人教版九年级下
English Description：
29.1 projection (second class) courseware ppt new curriculum standard people's Education Press
29.1 projection (second class) courseware ppt new curriculum standard people's Education Press
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中文说明：29.1投影（第二课时）课件ppt新课标人教版九年级下
English Description：
29.1 projection (second class) courseware ppt new curriculum standard people's Education Presszmj-7028-74908.rar