KELATIONSHIP BETWEEN DIFFUSION COEFFICIENT OF Cl ̄-IN SOIL AND WATER CONTENT AS WELL AS ETMPERATURE MOISTURE UNSTEADY-STATE DIFFUSION DURING HIGH TEMPERATURE DRYING OF MASSON PINE TIMBER STUDY ON THE DIFFUSION COEFFICIENT AND THE SURFACE EMISSION COEFFICIENT OF WOOD DRYING THE MATHEMATICAL ANALYSIS OF MC FIELD OF WOOD DURING THE PERIOD OF 100℃ TEST AND ITS APPLICATION FUNCTION