[填空题]
Two solid rods have the same elastic m/ba 7 yax bf.m(,9wfyhodulus, but one is twice as dense as the o/ a fa.h( bbymfwy9x,7snbst8da;i zrm: 432p 5b :vjdther. In which rod will the speed of longitudinal waves be greater, and b dbpmv:z8n;b5: ts2 4jris3ad y what factor?