A. according to the difference between wood board B. hand saw C. woodworking saw D. art knife

Board saws and woodworking saws are actually hand saws. The board saw is named because its saw blade looks like a "board", and the width of the saw blade is large and small; A woodworking saw has two rungs, one of which is supported in the middle. The saw blade is installed on one side of the crosspiece, and the other side is connected with a rope, which is mostly made by hand. The utility knife is just a simple tool to decorate the border and cut paper. Thin materials such as decorative board, wallpaper, veneer and gypsum board are used in the decoration, which has nothing to do with "saw".