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Allelopathic effect of extractor of Chinese-fir rhizosphere soil on germination of Chinese-fir seed An Examination of the Function of Male Flowers in an Andromonoecious Shrub Capparis spinosa A SURVEY OF STUDY ON VIBRATION AND EVALUATION OF RIDING COMFORT FOR J-50 TRACTOR A STUDY ON CAB NOISE OF CATERPILLAR SKIDDING TRACTOR 50