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83520In our class， most discussions and activities take place in assigned small groups.These groups provide a supportive and safe environment that（）learning.

83521The mayor decided to（）his speech in order to leave enough time for his audience to raise questions.

83522Too much（）to dirty air can cause people to suffer from allergies and diseases that will eventually affect people' s health.

83523In short， participation in sports is extremely（）for college students not only physically but also emotionally and socially.

83524Perhaps language should be（）as a road map and valuable possession.

83525I think I got serious about this only recently when I（）one of my former students， fresh from an excursion to Europe.

83526With this method， you can produce really designs with the simplest machines.

83527He carried the cup across the room， walking carefully for fear of the tea.

83528A firefighter tried to get into the burning house， but he was forced to by the intense heat.

83529If students don’t study their lessons as they were told， will show up quickly when they take an exam.

83530The bulletin board has become the children’s favorite， on which they often display their creative drawings.

83531Punishments for（）which is a form of intellectual dishonesty differ from country to country.

83532It’s（）to break into people’s house to take pictures.。

83533We can use special machines to detect（）money.。

83534Some students in our universiy have been（）for cheating on their final exams.

83535Nowadays all governments try their best to serve their people and fight against（）.

83536Competition in the financial market has profits.

83537Encourage your child to reach a（n） between what he wants and what you want.

83538Thousands of miles apart， we met with quarrels， and sometimes even a cold war，but we still to love.

83539Animal fats and sugar to a weight problem and can be a factor in heart disease.

83540The difficult curriculum， and fierce competition have a serious on students’ physical and mental health.

83541The local government has been providing（）support to them， without which they couldn’t have been so successful.

83542It was（）that the professor’s lecture failed to impress the students as some of them had left before it was over.

83543According to the terms of your（）， you must give three months’ notice if you intend to leave this company.

83544Shops try to meet the DIY fashion by offering consumers parts and hardware which they can（）at home.

83545We all admitted that the trip was worthwhile after we saw a（）palace and a fantastic museum.

83546My daughter was shy she was afraid to ask questions，（）to questions in class， or talk with other children.

83547The duties to provide services for children in need are not（）to the local social services department.

83548She（）her ambition of becoming a fashion designer after years of hard work.

83549Fortunately， the accident didn’t（）many people， for there was little traffic at that hour.

83550The key to an effective presentation is to state your points clearly and（）each of your points at the end of your presentation.。

83551We have sent our union（）to look into the case and see who is responsible.

83552I find it very difficult to（）the fact that two of our best students failed the exam.

83553Some of your suggestions have been（）， but others have been turned down as they are not workable.

83554Mary was a careful speaker every word seemed to have been（）before it was allowed to escape through her lips.

83555Jennifer couldn’t（）her tears when she saw the sick children at a new blood cancer center in Virginia.

83556The local government is pressed to find new places to（）waste

83557The wedding ceremony of my sister was a very（）experience for our family.

83558Thanks to the（）of air transport， everyone is free to go anywhere at any time.

83559In order to make sure he would be able to attend the meeting， I called him up two weeks（）.

83560Sam（）the gift of imagination from his family， but he lacked the driving power to take action.

83561After a（）physical exam， my doctor said I was in good condition except that my blood pressure was a little high.

83562共阴极七段数码管的公共端应接低电平

83563计数器置入数据的8，输入端DCBA应接

835641HZ的方波信号经过两次分频后周期为

83565计数器按CP脉冲的输入方式可分为

83566基本逻辑运算有

8356774LS161利用“异步清零”反馈到/CR端实现十进制，与非门的两个输入端应接74LS161的哪个输出端

83568晶振为32768 Hz，通过CD4060十三分频后可获得

83569组合逻辑电路

83570属于组合逻辑电路的部件是

83571请判断以下哪个电路不是时序逻辑电路

83572并行ADC转换器的精度主要与（）有关

835733位二进制并行比较型ADC转换器量化电压值为（）个基准电压。

83574ADC模数转换器的转换过程通过（）几个步骤完成。

83575在DAC数模转换电路中，当输入数据全部为“1”时，输出电压（）

83576在DAC数模转换电路中，数字量的位数越多，分辨输出最小电压的能力（）

83577由555定时器构成的多谐振荡器，可降低频率的方法是（）

83578由555定时器构成的多谐振荡器如图所示，其占空比的取值范围为（）

83579由555定时器构成的单稳态触发器，若电源电压为VCC =＋6V，则当暂稳态结束时，定时电容C上的电压 uC 为（）。

83580由555定时器构成的施密特触发器, 改变控制电压VCO 时, 则（）

83581下列各电路，具有脉冲幅度鉴别作用的电路是（）

83582用JK触发器构成异步五进制加法计数器，需要4个触发器。

83583从状态图中可以看出电路共有4个状态，那么就要选用（）个触发器。

83584最少可以用（）片74LS160连接成百进制的计数器。

83585使用清零法用74LS160实现八进制计数，应在计数状态到（）时清零。

83586使用清零法用74LS163实现十进制计数，应在计数状态到（）时，等下一个脉冲到来后清零。

8358774LS160的清零端是（）控制方式。

8358874LS163是（）进制的加法计数器。

83589移位寄存器具有（）功能

8359074LS373的输入信号被锁存是发生在LE为（）时。

83591如图所示的电路属于（）。

83592时序电路的逻辑功能可以用（）来描述。

83593数字电路分为组合逻辑电路和时序逻辑电路两大类。在时序逻辑电路中，输出由此刻的输入和电路原来的状态共同决定。（）

83594把JK触发器的J、K端都接高电平，可以转换为T'触发器。（）

83595抗干扰能力最强的触发器是（）。

83596对于边沿触发的触发器来说，其次态仅取决于CP信号为高电平或低电平期间输入端的逻辑状态。（）

83597如图所示是主从JK触发器，J=K=1时，触发器的功能特性是（）。

83598如图所示是脉冲触发的触发器，触发器输出状态的变化发生在CP信号为（）的时候。

83599如图所示是电平触发的RS触发器，当CP=1，输入S=0、R=1时，功能特性是（）。

83600如图所示是电平触发的RS触发器，只有在CP为高电平时，触发器的输出才可以按照输入信号置成相应的状态。（）

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