In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
With the implementation of 5 , 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 6 intece between user(application) program, normally referred to, as application processes, and the underlying communication services may be 7 . For example, one computer may be a small single - user computer, while another may be a large 8 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, 9 , 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. 某学院10名博士生(B1～B10)选修6门课程(A～F)的情况如下表(用√表示选修)所示。

	B1	B2	B3	B4	B5	B6	B7	B8	B9	B10
A	√	√	√		√				√	√
B	√			√				√	√
C		√			√	√	√			√
D	√				√			√
E				√		√	√
F			√	√			√		√	√

现需要安排这6门课程的考试，要求是： (1) 每天上、下午各安排一门课程考试，计划连续3天考完； (2) 每个博士生每天只能参加一门课程考试，在这3天内考完全部选修课； (3) 在遵循上述两条的基础上，各课程的考试时间应尽量按字母升序做先后顺序安排(字母升序意味着课程难度逐步增加)。 为此，各门课程考试的安排顺序应是 。