正方形的边长=周长÷4.______.(判断对错)
根据正方形的周长公式可得:边长=周长÷4.
所以题干说法正确.
故答案为:√.
(2011年湖南衡阳,11题,2分)学会分析,寻找规律是学好化学的方法之一。分析NaCl、X、HClO、KClO3、KClO4的排列顺序规律,可知X代表的物质是( )
A.HCl
B.Ca(ClO)2
C.Cl2
D.Cl2O
The Student Movement was ______ for the time being , but if nothing changes, something will happen again or even with a much greater force.
A.extinctive
B.deteriorated
C.degenerated
D.suppressed