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錯角---垂直平行綫
Activity
chanfushun
錯角---水平平行綫
Activity
chanfushun
錯角---不平行綫
Activity
chanfushun
同旁內角---垂直平行綫
Activity
chanfushun
同旁內角---水平平行綫
Activity
chanfushun
同旁內角---不平行綫
Activity
chanfushun
同位角---不平行綫
Activity
chanfushun
同位角__水平平行綫
Activity
chanfushun
同位角__垂直平行綫
Activity
chanfushun
reflection example
Activity
chanfushun
reflection example
Activity
chanfushun
reflection example
Activity
chanfushun
Rotate_object_angle_example
Activity
chanfushun
reflection example
Activity
chanfushun
坐標測量
Activity
chanfushun
