两个正方形的周长之比是5:3,那么它们的面积之比是______.
据分析可知:
两个正方形的周长之比是5:3,那么它们的面积之比是25:9.
故答案为:25:9.
_______ the whole society care for children as well as their parents, children can grow healthily and happily.
A.As soon as
B.Once
C.The moment
D.So long as
浇铸温度受()影响。
A.钢水成分
B.过热度
C.大包中包温降
D.等待温降