ICS03.200A12T/YXT中国研学旅行联盟团体标准T/YXT002-2017研学旅行基地设施规范Studytravelbasefacilityspecification2017-05-26发布2017-07-01实施中国研学旅行联盟发布T/YXT002-2017目录1范围...................................................................................

时间:2024-11-15 08:01栏目:综合大类