在教育教学中如何培养学生健康的心理

健康的心理要求人的个性具有独立、直爽、协作的善于与人交际、机灵、乐观、自信，有毅力和创新精神等特征。     

中国西南牡竹属二新种

Two new species of bamboo, Dendrocalamus ovatus Xia et Chia and D. textilis  Xia, Chia  et C. Y. Xia, collected  from  southwestern  China  aredescribed.     

概率为1的事件一定是必然事件吗?

我们知道,必然事件的概率一定为1,不可能事件的概率一定为0.对于随机事件呢?人教版高中数学教材(试验修订本·必修)中有这样的描述:将随机事件A的概率记作P(A),则有0≤P(A)≤1.在教学中,有不少师生提出这样的疑问:对于非必然事件和非不能事件,0≤P(A)≤1是不是应表述为0相似文献   

关于慈竹属和单竹属的讨论

 When F. A. McClure published the new genus Sinocalamus McClure in 1940, the 4 species he listed are S. latiflorus (Munro) McClure, S. beecheyanus (Munro) Mc- Clure, S. oldhami (Munro) McClure and S. affinis (Rendle) McClure.  After careful examination, the authors of this paper considered that the type species of McClure’s genus S. latiflorus (Munro) McClure should belong to the genus Dendrocalamus Nees, and the other species are of Bambusa Schreber.  Owing to Sinocalamus McClure is not a taxon representative of its type species, but a mixture, it must be rejected as a synonym of Dendrocalamus Nees.  In consequence then, the authors make adjustment to the taxonomic category of the 14 species and 1 variety which have ever been in Sinocalamus McClure.      As for the characters of Lingnania McClure, except that some differences exist in the vegetative parts, the structure of the spikelets is in the main the same as that of Bambusa Schreber.  Consequently, with regard to the systematic relationship, the authors consider it may be more resonable that the rank of Lingnania McClure should be alter- ed to Bambusa Schreber subg.  Lingnania (MeClure) Chia  et H. L. Fung; all the species of Lingnania McClure, except that L. tsiangii McClure should be transferred to Dendrocalamus Nees, should be assignable to Bambusa Schreber subg.  Lingnania (McClure) Chia et H. L. Fung.