10.(单选题,4.0分)-|||-微分方程 '=yln dfrac (y)(x) 的通解是(). ()-|||-A ln dfrac (y)(x)=cx+1-|||-B dfrac (y)(x)=Cx+1-|||-C dfrac (y)(x)=cx-|||-D lim _(xarrow 0)dfrac (y)(x)=cx