很好的，很简单的 播放器相信你见了之后，自己也会做了播放器的功能很简洁只有一选歌德特点-good, a very simple player believe you met, they would do the player's only function is a simple feature of the election Goethe

BP网络是一种多层前馈神经网络，其神经元的变换函数是S型函数-BP is a multilayer feed-forward neural network, neurons in the transformation function is S-type function