在一个基于CSMA/CA协议的WLAN网络中,计算机A有一个2时槽的帧间间隔,计算机

题型:单项选择题

问题:

在一个基于CSMA/CA协议的WLAN网络中,计算机A有一个2时槽的帧间间隔,计算机B的帧间间隔是6时槽,计算机C的帧间间隔是4时槽。以下说法中,正确的是______。

A.在CSMA/CA网络中不能够分配优先级
B.计算机A具有最高发送优先权
C.计算机B具有最高的发送优先权
D.计算机C具有最高发送优先权

考点:计算机软件水平考试高级网络规划设计师网络规划设计师
题型:单项选择题

It’s school time again! You’re probably feeling excited and maybe a little sad that summer is over. Some kids feel nervous or a little scared on the first day of school because of all the new things: new teachers, new friends, and even a new school. Luckily, these “new” worries only stick around (停留)for a little while. Let’s find out more about going to a new school.

Most teachers kick off the new school year by introducing themselves and talking about all the stuff you’ll be doing that year. Some teachers give students a chance to tell something about themselves to the rest of the class, too. When teachers do the talking on the first day, they often go over classroom rules and school rules so you’ll know what’s allowed and what’s not. Please pay close attention.

You might already know a lot of people in your classes on the first day, but it’s a great day to make a new friend, so try to say hello to kids you know and new ones that you don’t. Make the first move and you’ll be glad you did, and so will your new friend!

Seeing friends you haven’t seen in a while can make the first day a good one. You can make the day feel special by wearing clothes that you really like. Maybe you got a great T-shirt on one of your vacations, or a pair of sneakers(运动鞋). It also can make you feel good to be prepared and have all the things you need, such as pencils, folders, and whatever else you’ll be needing. But make sure that you pack them the night before in case (以防万一)you don’t have time in the morning.

小题1:The underlined phrase “kick off” in the second paragraph probably means “_____”.

A.start

B.study

C.find

D.teach小题2:The last paragraphs mainly tell us about ________.

A.what to know about a new school

B.how to prepare for a new school

C.what to do on your first day of school

D.how to spend your first day of school小题3:According to the passage you usually do everything on the first day of school except      .

A.introduce yourself

B.learn about the school rules

C.make new friends

D.go over your new lessons

题型:单项选择题

基金财产的性质有()。

A.是独立于管理人、托管人的固有财产

B.基金管理人、基金托管人不得将基金财产归人其固有财产

C.基金财产的债权不得与基金管理人、基金托管人固有财产的债务相抵消

D.相同基金财产的债权债务可以相互抵消

题型:单项选择题

动物性食物又称荤食,植物性食物又称素食,荤素搭配有助于()间相互取长补短。

A、营养素 

B、脂肪

C、蛋白质

D、维生素

题型:单项选择题

含皂苷为主要成分的中草药材,一般不宜制成注射剂,其原因是

A.刺激性

B.有泡沫

C.难溶解

D.溶血性

E.不稳定

题型:单项选择题

某药在pH4的溶液中有50%解离,该药的pKa为:

A.5

B.2

C.4

D.2.5

E.3

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