肠鸣音活跃和肠鸣音减弱分别见于哪些情况？

用长宽分别为4厘米、6厘米的长方形拼成一个正方形，至少要______个．

宋代是我国都市饮食市场的形成和发展空前繁荣时期。

Typically, these are concern with the establishment of (66) the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since 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 (67) interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be (68) For example, one computer may be a small single -user computer, while another may be a large (69) system. In the earlier days of computer communication, these issues meantthat 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 int erconnected 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, (70) , 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 beplaced into perspective with one another.

A. DNAB. SNAC. the OSI D. the ISO

为提高教学效果，教师在课堂教学中应该（）。

A.避免单一的教学方法，善于调动和控制课堂气氛

B.发挥学生学习的主动性

C.把科学研究引入教学过程

D.保持教师的威严使学生记住教师传授的知识

在窗体上画一个命令按钮(其Name属性为Command1)，然后编写如下代码：Private Sub Command1_Click( )Dim a(5,5) For i=1 To 3 For j=1 To 4a(i,j)=i*j Next Next For n=1 To2 For m = 1 To3 Print a(m,n); Next Next End Sub 程序运行后，单击命令按钮，输出结果是

A．2 4 6 1 2 3

B．1 2 3 2 4 6

C．1 2 3 4 5 6

D．6 5 4 3 2 1