偏微分方程里的问题A uniform string of length πl is fastened at its ends x=0,x=πl.The point x=1/3πl is drawn aside a small distance b ,and the string released from rest at time t=0.Show that,if Tis the tension and ρ the density per unit l

偏微分方程里的问题A uniform string of length πl is fastened at its ends x=0,x=πl.The point x=1/3πl is drawn aside a small distance b ,and the string released from rest at time t=0.Show that,if Tis the tension and ρ the density per unit l 在英语里,是a uniform,还是an uniform 是He'got a uniform.还是He's got an uniform?一道按正确的形式填空：He'got _______（a） uniform.a 还是 an 微分方程的问题, 常微分方程的问题 常微分方程的问题 微分方程通解的问题. 关于过去分词和现在分词作状语的问题,dressed in a blue uniform and with a rifle over his shoulder,dressed in a blue uniform and with a rifle over his shoulder,the prisoner marched boldly up and down in front of the camp.新概念2里 偏微分方程(PDE)问题 偏微分方程问题 dress a uniform 还是wear a uniform dess与wear的区别是什么? uniform为什么是a uniform而不是an uniform? uniform为什么是a uniform而不是an uniform? 求解微分方程初值的问题 微分方程的基础问题求教 a uniform还是an uniform急 wear a uniform 还是wear uniform 请问 a uniform gravitational field 中的 uniform