13 单选(4分)-|||-微分方程 (ln y-x)dy-ydx=0 的通解为 ()-|||-A. =ln y+dfrac (1)(2)+dfrac (C)({y)^2}-|||-B. =ln x-dfrac (1)(2)+dfrac (C)({y)^2}-|||-O C. =ln x+dfrac (1)(2)+dfrac (C)({y)^2}-|||-D.-|||-=ln y-dfrac (1)(2)+dfrac (C)({y)^2}