TAs were being also very good. This material is hard, but necessary for comp sci and Dai is the best teacher for it. Examine/follow/check with questions and you'll do good in his class. He is a good professor. 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)。... https://dongkhai60482.blogdosaga.com/36466414/details-fiction-and-dong-khai