19.在长14.2dm,宽9.6dm的长方形中,剪半径是1dm的圆,能剪( )个.
A. | 126 | B. | 28 | C. | 25 | D. | 140 |
18.下列各图中能折成正方体的是( )
0 156035 156043 156049 156053 156059 156061 156065 156071 156073 156079 156085 156089 156091 156095 156101 156103 156109 156113 156115 156119 156121 156125 156127 156129 156130 156131 156133 156134 156135 156137 156139 156143 156145 156149 156151 156155 156161 156163 156169 156173 156175 156179 156185 156191 156193 156199 156203 156205 156211 156215 156221 156229 199269
A. | B. | C. | D. |