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Testing Damage Process of David Poplar under the Dynamic Loads Based on Acoustic Emission Technique Characterization of Fertility Alteration in 8 Environment-sensitive Genic Male-sterile Lines of indica Rice The construction and application of an agricultural ecological-economic system coupled process model A Chemical Drying Technique for Plant Materials Applied to the Scanning Electron Microscopy A New Drying Method of Plant Specimens for Scanning Electron Microscopy the t-Butyl Alcohol Freeze-Drying Method