20.下列各数中,大于0.5而小于0.6的是( )
| A. | 0.52 | B. | 0.62 | C. | 0.42 | D. | 0.61 |
15.下面三条线段能围成一个三角形的是( )
| A. | 2cm 3cm 3cm | B. | 3cm 5cm 8cm | C. | 2cm 3cm 6cm |
13.在长6厘米,宽4厘米的长方形内画一个最大的圆,这个圆的面积是( )
0 134745 134753 134759 134763 134769 134771 134775 134781 134783 134789 134795 134799 134801 134805 134811 134813 134819 134823 134825 134829 134831 134835 134837 134839 134840 134841 134843 134844 134845 134847 134849 134853 134855 134859 134861 134865 134871 134873 134879 134883 134885 134889 134895 134901 134903 134909 134913 134915 134921 134925 134931 134939 199269
| A. | 50.24cm2 | B. | 24cm2 | C. | 12.56cm2 |