1. (2023春•监利市期中)如图,可导函数y=f(x)y=f(x)y=f(x)在点P(x0P(x_{0}P(x0,f(x0))f(x_{0}))f(x0))处的切线为l:y=g(x)l:y=g(x)l:y=g(x),设h(x)=f(x)−g(x)h(x)=f(x)-g(x)h(x)=f(x)−g(x),则下列说法正确的是((( )))