已知函数f(x)=x2+5x,x≥0-ex+1,x<0若f(x)≥kx,则k的取值范围是( )
—Father's Day is coming. Could you tell me ________? —What about a watch? He'll like it.
下列调查中,适宜采用全面调查(普查)方式的是( )