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By studying the internal structure and working principle of 555 timer, this paper introduces three typical circuits----Schmitt trigger, Bistable multivibrator and Astable multivibrator----which are composed by 555 timer. Furthermore, it explores the various applications of 555 timer in circuit designing through the expansion of the circuits and eventually same experience and methods offers in circuit designing by using 555 timer.

本文通过研究555定时器的内部结构和工作原理，介绍了其组成的施密特触发器，单稳态触发器和多谐振荡器等三个典型电路，并通过这些电路的扩展，探讨了555定时器在电路设计中的各种应用，由此得出用555定时器设计电路的经验和方法。

A case studying of designing the key parts of an astronomic telescope modeled with extended DSM is presented, showing the approach is practicable and valuable.

最后以某天文望远镜的关键部件的实例设计过程为例，说明了该方法的可行性和实用性。

One may be a great scientist studying complex questions of astrophysics and cosmology.

一个可能是一个伟大的科学家研究复杂问题的天体物理学和宇宙学。

At 19, when I began studying astrophysics, it did not bother me in the least to be the only woman in the classroom.

岁时，当我开始研究天体物理学，它没有在最不打扰我是在课堂上的唯一女性。

At 19, when I began studying astrophysics, it did not bother me in the least to be theonly woman in the classroom.

在19岁的时候，我开始学习天体物理学，作为班上唯一的女性，我一点也不觉得苦恼。

When we look at input sizes large enough to make only the order of growth of the running time relevant, we are studying the asymptotic efficiency of algorithms.

当投入规模大到足够确定相关命令运行时间的情况下，我们应该学习渐进效率算法。

Time relevant, we are studying the asymptotic efficiency of algorithms. That is, we arethe limit, as the size of the input increases without bound. Usually, an algorithm that is

即，当输入大小的增加没有限制，我们就要考虑怎样计算运行时间的增长变化，就像输入大小有限制的时候那样。

Studying the mean value of two Smarandache LCM Functions by using elementary and analytic method,and giving their asymptotic formula.

利用初等方法研究了两个包含Smarandache LCM函数的均值性质，并给出其渐近公式。

This paper is devoted to studying the asymptotic behavior of the intermediate point in the mean value theorem for first form curve integrals.

摘要讨论了第一类曲线积分中值定理"中间点"的渐近性质，得到了更具一般性的新结果。

Second, by studying the asymptotic behavior of the solution, we obtain the existence of random attractor for the stochastic quasi-geostrophic dynamical system.

另一方面，通过研究解的渐近行为，我们得到随机准地转动力系统的随机吸引子的存在性。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。