如图所示,甲、乙、丙三个逻辑电路的符号分别表示 A.“与”门、“或”门、“非”

题型:选择题

问题:

如图所示,甲、乙、丙三个逻辑电路的符号分别表示

 

A.“与”门、“或”门、“非”门

B.“与”门、“非”门 、“或”门

C.“或”门、“与”门、“非”门

D.“或”门、“非”门 、“与”门

考点:逻辑电路
题型:选择题

振源A带动细绳振动,某时刻形成的横波波形如图所示,在波传播到细绳上一点P时开始计时,则图乙中能表示P点振动图象的是(  )

A.

B.

C.

D.

题型:选择题

1927年国民革命失败了。这里所说的“失败”主要是指[ ]

A.反帝反封建的革命任务没有完成

B.革命统一战线破裂

C.蒋介石、汪精卫叛变革命

D.南京国民政府成立

题型:选择题

数据库系统的核心是【 】

A.数据模型

B.数据库管理系统

C.软件工具

D.数据库

题型:选择题
阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出最佳选项。
Most of us lose life’s tough battles by starting an unexpected attack—when a touch of humor might well enable us to win.   the case of a young friend of mine, who was     in a traffic jam on his way to work shortly after receiving a warning about being late for the job.     there was a good reason for Sam’s being late—serious illness at home—he    that this by-now-familiar excuse wouldn’t     any longer. His boss was probably already pacing     preparing a speech to fire him.
Yes, the boss was. Sam entered the office at 9:35. The place was as     as a locker room;     was hard at work. Sam’s boss came up to him angrily. Suddenly, Sam    and stretched out his hand. “How do you do!” he said. “I’m Sam Maynard. I’m applying for a    , which, I understand, became    just 35 minutes ago. Does the     bird get the worm?”
The room exploded in laughter. The boss     a smile and walked back to his office. Sam Maynard had    his job—with the only    that could win-–a laugh.    is a most effective, yet frequently neglected ,means of handling the difficult situations in our lives. It can be used for making up differences, apologizing, criticizing and     the other fellow to do what you want     his losing face. For some jobs, it’s the only tool that can succeed. It is a way to discuss subjects so   that serious dialogue may start a quarrel.   , many believe that comedians(喜剧演员) on television are doing more today for racial and religious problems than people in any other field.
小题1:
A.ThinkB.ImagineC.SupposeD.Consider
小题2:
A.dugB.trappedC.eruptedD.aimed
小题3:
A.IfB.BecauseC.UnlessD.Although
小题4:
A.decidedB.saidC.talkedD.urged
小题5:
A.workB.useC.countD.make
小题6:
A.here and thereB.in and outC.up and downD.now and then
小题7:
A.silentB.cleanC.noisyD.quiet
小题8:
A.somebodyB.everybodyC.nobodyD.anybody
小题9:
A.criedB.shoutedC.staredD.smiled
小题10:
A.prizeB.patentC.punishmentD.job
小题11:
A.availableB.fragrantC.possibleD.reasonable
小题12:
A.lazyB.lateC.diligentD.early
小题13:
A.sentB.hidC.forceD.had
小题14:
A.protectedB.savedC.holdD.took
小题15:
A.toolB.techniqueC.measureD.instrument
小题16:
A.UnderstandingB.ApologyC.HumorD.Communication
小题17:
A.makingB.havingC.lettingD.getting
小题18:
A.withoutB.forC.toD.with
小题19:
A.constantB.easyC.sensitiveD.heated
小题20:
A.After allB.For exampleC.At lengthD.Even so
题型:选择题

组装K344型封隔器时长胶筒从()套入。

A.锥体

B.调节环

C.中心管

D.限位套

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