Preliminary Research of Castanopsis hystrix and Betula alnoides Plantation Wood Applied in Furniture and Decoration Study on Wearing Resistance and Hardness of the Nano-Al2O3 Modified Waterborne Wood Coating THE LOADING FORCE ANALYSIS OF THE LEANING WEAR OF SAW CHINA LINKS AND THE METHODS FOR SOLUTION STUDY ON THE CALCULATION OF DEVIATING WEAR AND TEAR OF GUIDE BLOCK AND ITS APPLICATION WEAR OF DIAMOND COATED IN THE CONTINUOUSLY MACHINING PARTICLEBOARD