A:run
B:running
C:runs
青藏高原上的主要农作物有( )
- I don't think students should use mobile phones at school.
- ______. They really have a bad influence on our study.
有一块直角边AB=3cm,BC=4cm的Rt△ABC的铁片,现要把它加工成一个正方形(加工中的损耗忽略不计),则正方形的边长为( )