“弦切角”教案

教学目的:(1)使学生掌握弦切角的概念,领会弦切角定理的证明要点;(2)使学生初步掌握弦切角定理的应用。培养学生分析归纳问题的能力。重点:弦切角的概念及弦切角定理的应用。难点:弦切角定理的证明的分析。教学过程: 一、课题引入 (1)提问:前面我们已经研究了圆周角,什么叫做圆周角?

ELECTRONMICROSCOPIC OBSERVATION ON MYCOPLASMA-LIKE ORGANISMS IN THE LEAF OF CALADIUM HORTULANUM

Since Doi et al. (1967) discovered mycoplasma-like organisms in plants, more than 90 plant diseases have been proved to be caused by them. The present paper reports the mycoplasma-like organisms observed in leaves of Caladium hortulanum of Araceae.

OBSERVATIONS ON THE VARIATION OF THE METACERCARIA OF PARAGONIMUS WESTERMANI

H. T. Chen made a dog infected with 6 platy-form metacercariae obtained from the fresh water crab-Potamon denticulatum, thus acquiring one adult worm named. P. asymmetricus as a new species.

ON RELATIONS BETWEEN SIGNAL AND ITS PHASE

Let x(n) and y(n) (n=0, 1, 2,…) be two real sequences, X(z) and Y(z) be their z-transforms respectively:

The Effect of Lateral Guiding Mechanism on Noise Characteristics in Semiconductor Lasers

A comparison between intensity noise spectra and also the line shapes of gain-guided, weakly-index-guided, and strongly-index-guided semiconductor lasers are made using numerical solution of Maxwell-Bloch equations including spontaneous emission noise.

心系百姓解民忧——山东省教育厅驻郓城县张鲁集乡第一书记工作组帮包工作纪实

2015年2月,根据山东省委组织部选派,省教育厅王夫海、林乙楠、郭智深、王坤、杨大伟等5名同志组成工作组赶赴郓城县张鲁集乡,开始了为期两年的挂职“第一书记”工作。入村以来,他们紧紧围绕省委、省政府抓党建促脱贫的要求,在厅党组和郓城县委、县政府领导下,紧扣精准扶贫中心主题,结合十二项扶贫重点任务,凝心聚力,锐意进取,