设函数F(x,y)有连续的偏导数,且F(x,y)(ydx+xdy)是某个函u(x,y)的全微分,则F(x,y)应满足()
A.∂F/∂x=∂F/∂y;
B.x(∂F/∂x)=y(∂F/∂y);
C.y(∂F/∂x)=x(∂F/∂y);
D.-x(∂F/∂x)=y(∂F/∂y).
正确答案是B
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