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Application Prospect on Applying Nondestructive Testing Technology in Wood Property Breeding of Larix kaempferi Effects of Sensor Quantity and Planar Distribution on Testing Results of Log Defects Based on Stress Wave Construction of Stress Wave Time Isolines on Log Cross Section and Analysis of Its Effect Factors Research and Development on 2D Imaging Technology of the Decay in Trees and Logs Preliminary Study on the Melon-Shaped Column Structure in the Grand Hall of Ningbo Baoguo Temple