一组数据35,35,36,36,37,38,38,38,39,40的极差是______.
由题意可知,数据中最大的值40,最小值35,所以极差=40-35=5.
故填5.
It is reported that the police will soon ____ the case of two missing children.
A.look upon
B.look after
C.look into
D.look out
如图,塑料挂衣钩紧贴在墙壁上钩上挂一物体时处于静止状态,下列关于挂衣钩的说法中正确的是( )
A.它受到的大气压减小
B.它受到的重力增加
C.它对墙壁的压力增加
D.以上说法都不对