$3.(2$ points$)$ For the girder $\backslash ($ H K $\backslash ),$ draw the influence lines for the reaction at $\backslash ($ H $\backslash ),$ the shear between $\backslash ($ H $\backslash )$ and $\backslash ($ I $\backslash ),$ the moment at $\backslash ($ I $\backslash ),$ and the shear between $\backslash ($ I $\backslash )$ and $\backslash ($ J $\backslash ).$ Assume the load is applied to the upper beams $\backslash ($ A$-$G $\backslash ).$