单选题:传统的集合运算包括( )。 题目分类:VF 题目类型:单选题 查看权限:VIP 题目内容: 传统的集合运算包括( )。 A.并、差和选择 B.并、交和投影 C.交、差和选择 D.并、差和交 参考答案: 答案解析:
根据材料,回答问题。 Study Helps Predict Big Mediterranean Quake Scien 根据材料,回答问题。 Study Helps Predict Big Mediterranean QuakeScientists have found evid 分类:VF 题型:单选题 查看答案
This table is strong and durable. This table is strong and durable.A.long-lasting B.extensive C.far reaching D.ete 分类:VF 题型:单选题 查看答案
The police will need to keep a wary eye on this area of town The police will need to keep a wary eye on this area of town.A.naked B.cautious 分类:VF 题型:单选题 查看答案
回答题Pedestrians Only1. The concept of traffic-free shopping a 回答题Pedestrians Only1. The concept of traffic-free shopping areas goes back a lon 分类:VF 题型:单选题 查看答案