在无线通信中不能采用CSMA/CD方式,这是因为无线通信存在 (12) ,采用CSM

题型:单项选择题

问题:

在无线通信中不能采用CSMA/CD方式,这是因为无线通信存在 (12) ,采用CSMA/CA技术是指 (13) ,MAC层的分布式协调功能提供 (14) ,站点发出的确认帧ACK,要在 (15) 间隔发送。为解决隐蔽站带来的问题,802.11允许 (16)

15()

A.PIFS

B.DIFS

C.CIFS

D.SIFS

考点:计算机软件水平考试中级网络工程师中级网络工程师上午试题
题型:单项选择题

A good way to pass an exam is to work hard every day in a year. You may fail in an exam if you are lazy for most of the year and then work hard only a few days before the exam. If you want to be good at English, you have to read stories in English, and to speak English as much as possible. A few days before the exam you should go to bed early. Do not go to bed late at night. Before you start answering in the exam, read carefully over the question papers, and try to understand the meaning of each question. When you have finished your exam, read over your answers. Correct the mistakes and be sure that you don’t miss anything out.

小题1:If people want to do well in an exam, they have to work hard ______.

A.every day in a year

B.for most of the month

C.for a few days

D.late at night小题2:If people want to learn English well, they ______.

A.read stories in English

B.should go to bed early

C.Both A and D

D.must often practice English小题3:It is important to ______ a few days before the exam

A.study harder

B.have a good sleep

C.read the question papers

D.have a good drink小题4:When people have finished the exam, they should ______.

A.stand up and leave at once

B.answer a few more questions

C.make sure that they don’t miss anything out

D.discuss with other students小题5:The best title for the passage is ______.

A.An Important Exam

B.An Easy Exam

C.Get Ready For Exams

D.How to Pass an Exam

题型:单项选择题

在近代,西方主要国家走上资本主义道路是历史的进步。伴随着资本主义的发展,它们强起后,对外侵略扩张,给世界带来战争和灾难。中国人民为争取独立、民主和富强,在中 * * 党的领导下,进行了艰苦卓绝的斗争,走了上建设有中国特色社会主义强国之路,并日益成为捍卫世界和平与发展的重要力量。

运用所学历史知识回答下列问题:

(1)举例说明西方主要国家是怎样以不同方式确立资本主义制度的?

___________________________________________________________________________________________

(2)概述西方列强在自由资本主义和垄断资本主义不同阶段对外侵略扩张的特征并分析其原因。

___________________________________________________________________________________________

(3)实现中 * * 伟大复兴的前提条件是什么?中国社会主义制度是怎样确立的?为建设有中国特色的社会主义,十一届三中全会作出了什么伟大决策?20年来取得了哪些重要的建设成就?

___________________________________________________________________________________________

(4)中国是捍卫世界和平与发展的重要力量,即使富强之后,也不会威胁别人,为什么?

___________________________________________________________________________________________

题型:单项选择题

委托人和监理人签订合同的根本目的是( )。

A.选择合适的监理单位
B.确定监理的范围
C.监理报酬的计算
D.明确双方的权利和义务关系

题型:单项选择题

下列不征房产税的是()

A.国有企业的厂房

B.农村房屋

C.个人出租的住房

D.境内外资企业的办公用房

题型:单项选择题

女性,29岁,长期乏力求医。血红蛋白77g/L,平均红细胞血红蛋白浓度26%,平均红细胞体积63fl。网织红细胞计数2.0%,血清铁5μmol/L(280μg/L),总铁结合力4980μg/L。

该患者最可能的诊断是()

A.溶血性贫血

B.再生障碍性贫血

C.缺铁性贫血

D.慢性炎症性贫血

E.巨幼红细胞贫血

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