A:为了收藏,发行票证
B:物资丰富,敞开销售
C:照顾贫困,方便使用
D:物资匮乏,计划供应
已知实数a是x2﹣5x﹣14=0的根,不解方程,求(a﹣1)(2a﹣1)﹣(a+1)2+1的值.
雾霾天气的形成过程中,大气层结(大气中温度、湿度等要素随高度的分布)稳定、风力弱、空气湿度大均起重要作用。读某地区最冷月平均等温面分布图,仅考虑海拔对气温的影响,丙、丁两地的相对高度可能是( )
No. 1 Middle School
Don't run in the hallways
Don't bring food into the classroom.
Don't listen to music in class.
You have to wear a uniform.
No. 2 Middle School
Don't bring food into the classroom
Don't wear a hat in class.
Don't go into the classroom without the teacher.
No. 3 Middle School
Don't listen to music in the classroom.
Don't run in the hallways.
You have to wear sports shoes for gym class.
材料一: 乾隆给英王的敕谕说:“天朝物产丰盈,无所不有,原不籍外夷货物以通有无。”
材料二: 嘉庆帝的上谕说:“天朝富有四海,岂需尔小国些微货物哉?”