(____) What does your mother do?
(____) Oh, great!
(____) She's a nurse.
(____) Look! This is my mother.
(____) Oh! She's beautiful.
某棵果树前x年的总产量y与x之间的关系如图所示,从目前记录的结果看,前x年的年平均产量最高,则x的值为()
如图,两正方形彼此相邻且内接于半圆,若小正方形的面积为16cm2,则该半圆的半径为( )