Wood keys must. It is a single sheet of wood.Wide and thick over wooden flooring is one place you don't lose the House along the Poles, Nantong (Zhong), only the Middle bedroom.
Wood keys to a single timber size. And thicker wood flooring house. A single piece of wood laid across the guidelines (the commission) on the pole. Only midway bedroom
Wood wooden keys to single sheet size width and thicker wood floor houses. A single piece of wood put across based approach (Zhong) on the pole head only the middle bedroom.