俄罗斯方块游戏程序。学习vc时的习作。完成常规单机版俄罗斯方块的功能，包括播放声音，积分以及等级和速度选择等。-Tetris Game procedures. Vc exercises at the time of study. Completion of conventional stand-alone version of Tetris, including playing a sound, integral as well as the level and speed of selecti