For inviscid Burgers'equation【图片】with initial data【图片】, if【图片】, during the evolution there appear altogether __ shock wave(s) and ____ rarefaction fan(s).(Separated by commas)
【简答题】Find nine more phrases. You can go up. down, or across. during the week ________ ________ ________ ________ ________ ________ ________ ________ ________