discrete DCT离散DCT变换discreteadj.不连续的；分离的Discrete mapping modeling离散映射建模discrete random variables离散型随机变量discrete variation method离散变分方法discrete element modeling离散元数值模拟discrete interval theorem分立间隔定理discrete switched systems离散切换系统discrete line recognition离散直线段识别Discrete wavelet transfer离散小波变换discrete design variables离散设计变量discrete frequency control离散频率控制