前言： 目的：探讨对于需减数治疗的正畸疑难病例选择性拔除一组磨牙，以实现保留28个牙齿的可行性。
Objective:To discuss the feasibility of reservation 28 teeth by removal of a group of molars to difficult patients who need extraction treatment.
观察结果提示了柿树多倍体由未减数配子受精产生的可能性。
These phenomena show the possibility of producing polyploid of Diospyros kaki L. by the unred…
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