Contains IEC documents describing testing implementations of IEC 60870-5, amendment to IEC 60870-5-104, and GBC reports helping faster understand the standard

经典的俄罗斯方块游戏！绘制的图形文本框，实现俄罗斯方块游戏的全部功能，界面简洁清晰！-The classic game of Tetris! Draw graphical text box to achieve the full functionality of the Tetris game, the interface is simple and clear!