Subscribe to America's major dictionary and get 1000's extra definitions and Innovative look for—ad totally free!indicative indicative present indef. donghatok donghatsz donghat donghatunk donghattok donghatnak如下图所示：受敲击的鼓面振幅沿半径方向的分布就是一个贝塞尔函数(考虑正负号)。实际上，这些�