旅游区具有的特性（）a系统性b地域性c层次性d优化型e相似性 ["abcd","acde","abde","bcde"]
GB是中国标准感光制式。
明代内阁直达皇帝的机密文书是（） ["题本","揭帖","奏本","奏折"]
检定的设备无需对其检定结果进行确认。
If the teacher uses the same techniques, some students may not have the chance to learn in the way that suits them best.（）
简述艺术批评在形态上的分类。
