In this paper, in order to study the growth of a zero order Dirichlet series on the left half-plane,we define the exponential order and the exponential low orderand study them by drawing support from the coefficient of Dirichlet series.

本文研究半平面上的零级Dirichlet级数的增长性,定义了半平面上的零级Dirichlet级数的指数级和指数下级,通过用零级Dirichlet级数的系数,得到了其与系数之间的关系。

By the questionnaire survey and analysis of students number in class teaching of secondary school in our country,we come to the conclusion: at present,the number of students in a classin rural and urban secondary school is too much,and the ideal students number of a class should be set for 30~40 in the teaching process.

通过对我国当前中学班级化教学中班级人数的情况进行问卷调查和分析,得出结论:目前,我国农村和城镇中学班级人数均严重偏多,而教学过程中,班级学生理想人数应设置为30~40人。

This papet has defined lower order of analytic function f 1(s) defined by lower side Dirichlet seriesconvergence on the left half plane σ< 0,and lower side random Dirichlet series( σ< 0)on the probability space (Ω,A,P).

对于在左半平面σ< 0内收敛的下侧Dirichlet级数所定义的解析函数f1(s)定义了下级 ,定义了在概率空间 (Ω ,A,P) 上的下侧随机Dirichlet级数的下级 (σ< 0 ) ,研究了两类级数所定义的解析函数f1(s) ,f1(s,ω)的下级存在的条件 ;对两类由上、下侧级数迭代而成的关于无穷乘积的级数 ,讨论了它们与无穷乘积的收敛性 ,建立了它们的和函数f1[f(s) ]与f1[f(s,ω) ]在σ >0内的下级与其系数及指数之间的关系