搜题请搜索小程序“爱下问搜题”
问题 单项选择题

ISDN为了使通信网络内部的变化对终端用户是透明的，它必须提供—个标准的______。

A．用户接口

B．数据速率体系

C．网络接

D．网络协议体系

答案

参考答案：A

解析：[知识点] Internet接入方法[评析] 近年来，ISDN致力于实现以下目标： 1、提供一个在世界范围内协调一致的数字通信网络，支持各种通信服务，并在不同的国家采用相同的标准。 2、为在通信网络之间进行数字传输提供完整的标准。 3、提供一个标准用户接口，使通信网络内部的变化对终端用户是透明的。

单项选择题 共用题干题

张某，男性，65岁，教师。因左眼胀、眼痛并微感头痛和视物模糊7月而入院。7个月前左眼开始发生眼胀，早晨或用眼后加重，休息后则症状消失，故未加以注意。4个月前除眼胀外并有眼痛和轻微头痛，近来视物也感模糊，故来求医。以往身体健康，无特殊病史，全家成员也无类似疾病，据说前辈人有因眼病而失明者。眼部检查视力：右眼1.0，左眼0.6，双眼结膜不充血，血管清晰，巩膜无黄染；角膜透明无混浊，前房深度正常，虹膜纹理清楚。瞳孔：右眼无后粘连，直径3mm，对光反应良好；左眼亦无后粘连，直径5mm，对光反应稍迟钝。两眼晶状体、玻璃体透明。眼底：右眼基本正常，左眼视 * * 色淡，凹陷较大，其中可见灰色小点，杯盘比为0.7，视 * * 血管向鼻侧移位，在视 * * 边缘呈屈膝状态。两眼球运动正常，无偏斜、突出和凹陷。特殊检查眼压：右5.5/5=17.30mmHg，左7.5/3=35.76mmHg，24小时眼压曲线超出正常范围。视野：右眼基本正常，左眼有弧形暗点，于水平线处呈阶梯状，周边视野呈向心性缩小。前房角镜检查：两眼前房角均开放。

如果患者药物治疗后，眼压仍然较高视野进行性缩小，应该选择最佳的手术方法是（）。

A.白内障囊外摘除术

B.白内障超声乳化吸出术

C.小梁切除术

D.睫状体冷冻术

E.激光虹膜周边切除术
查看答案
单项选择题

Questions from 36 to 40 are based on the following passage: There are a lot of “markets”. Some markets are local; you may be willing to compare prices for fruits and vegetables in a few shops in your local area, but you would be unwilling to go across the city to find out more information. Some markets are national. Many firms sell goods across the country. Some markets are global or international. Increasingly, more and more countries are involved in the world economy, whether they know about it or not.However, there are many other markets: labor markets for job seekers, supermarkets for grocery shopping, foreign exchange market, capital market, real estate markets and so on. And we must not overlook the fact that many services such as banking, insurance are also bought and sold on a worldwide scale. But what is a “market” Most people would say, “A market is a place where enough buyers and sellers meet face to face, so that a market price for goods and services can be determined.” However, with rapid growth of telecommunications, it is no longer necessary for buyers and sellers to physically meet to form a market.You may hear the terms “global market” or “global economy”. What do those terms mean to you What do they mean to business today Thanks to the Information Age we are seconds away from the rest of world. Business everywhere recognizes that they can expand their market to anywhere and do business at any time because of the Internet. Now, the Internet is the fastest growing market in the world today, yet buyers and sellers don’t even have to leave their own homes to transact business.In the modern world, a market can take many forms. Generally speaking, a market may be housed in a place, or it may exist only in people’s minds. And a market can be any place or process that brings together buyers and sellers with a view to agreeing to a price.

Which of following markets is not mentioned in the passage （）

A．Asian market

B．international market

C．national market

D．local market
查看答案