A:和0.30
B:3和0.30
C:和0.28
D:3和0.28
属于单细胞的藻类是( )
已知正方形ABCD的面积为9cm2,正方形EFGH的面积为16cm2,则两个正方形边长的相似比为____.
— Archimedes was really a wise man. He could easily ________ the king's problem.
— Yes, so he was. And he was also a great scientist who had a lot of ________.