重大危险源评价以危险单元作为评价对象。某烟花爆竹厂在进行危险单元的划分时，正确的做法

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

With the implementation of (1) , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (2) interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be (3) . For example, one computer may be a small single - user computer, while another may be a large (4) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (5) , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.

3（）

A．same

B．similar

C．different

D．dependent

　　于是，一条大江低声吟唱着，不分时刻地向前奔流。他变得十分强壮，积蓄了巨大无比的精力。他眺望着远远隐在白云里的山峰，以洪亮而低沉的胸音向他们打招呼。他不费力就掀起一阵汹涌的波涛，他沉着地举起庞大的轮船帮助他们迅速航行。他负担着许多．可是他不感觉什么负担。大江就这样奔流，不断向前奔流。

　　那些被波浪卷起，跟随大江行进的泥沙却感到累了，问：

　　“喂，大江！老这么跑，到底要往什么地方去呀？”

　　大江回答：

　　“还要到前面去呀。”

　　疲乏得喘不过气来的泥沙愤愤地说：

　　“'前面'，'前面'！哪有那么多的'前面'！已经走得差不多了，还是歇口气吧！”大江的记性很好，他没有忘记自已原来是小溪流，轻轻地笑了笑：

　　“为什么？不行！不能停留！”

　　泥沙带着怨恨。偷偷地沉下去了。可是大江还是不住地奔流。许多天就好像一天，许多月就好像一月，他经过了无数繁荣的城市和无数富足的乡村，为人们做了无数事情，终于到了海口。

　　大江还是不知道疲倦是怎么一回事；他奔流着，奔流着，永远向着前方。

1、作者是这样写的：小溪“用清亮的嗓子歌唱”，小河“沙声地歌唱着”，大江“低声吟唱着”，为什么会有这样的变化？

　_______________________________________________________________________________

2、文中写泥沙有什么作用？

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3、“大江的记性很好，他没有忘记自己原来是小溪流”这句话是什么意思？

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4、泥沙为什么“带着怨恨，偷偷地沉下去了”？

　_______________________________________________________________________________

5、你从大江的奔流中得到什么启发？

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优秀人才管理有时特指（）。

A、员工保留

B、员工开发

C、员工招聘

D、员工甄选

试论中国古代数学的主要成就与主要特点。