17.
如图,在△ABC中,AC=4cm,线段AB的垂直平分线交AC于点N,△BCN的周长是7cm,则BC的长为( )
0 291037 291045 291051 291055 291061 291063 291067 291073 291075 291081 291087 291091 291093 291097 291103 291105 291111 291115 291117 291121 291123 291127 291129 291131 291132 291133 291135 291136 291137 291139 291141 291145 291147 291151 291153 291157 291163 291165 291171 291175 291177 291181 291187 291193 291195 291201 291205 291207 291213 291217 291223 291231 366461
| A. | 1 cm | B. | 2 cm | C. | 3 cm | D. | 4cm |