问题 单项选择题

计算机综合布线过程中,铺设金属管应尽量减少弯头,按照规定,每根金属管的弯头应不超过______,如果在金属管中需要串接3条电缆,电缆测量总长度为1600m,则至少需要订货的电缆长度为______。

A.1600m
B.1778m
C.1800m
D.1760m

答案

参考答案:B

解析:计算机综合布线过程中,在敷设金属线管时应尽量减少弯头,每根金属管的弯头不宜超过3个,直角弯头不应超过2个,并不应有S弯出现,对于截面较大的电缆不允许有弯头,可采用内径较大的管子或增设拉线盒。其中弯曲半径应符合下列要求:
(1)明配管时,一般不小于管外径的6倍;只有一个弯时,可不小于管外径的4倍;整排钢管在转弯处,宜弯成同心圆形状。
(2)明配管时,一般不小于管外径的6倍,敷设于地下或混凝土楼板内时,应不小于管外径的10倍。
(3)电线管的弯曲处不应有折皱、陷和裂缝,且弯扁程度不应大于管外径的10%。
订购电缆时,必须考虑:
(1)确定介质布线方法和电缆走向;
(2)确认到管理间的接线距离;
(3)留有端接容差。
电缆的计算公式:订货总量(总长度m)=所需总长+所需总长×10%+n×6
式中,所需总长指n条布线电缆所需的理论长度。所需总长×10%为备用部分。n×6为端接容差。
根据公式,m=1600+1600*10%+3*6=1778m

完形填空
It was her giggling that drew my attention.Note taking really wasn’t all that funny.
Walking over to the offender, I asked for the    21 .Frozen, she refused to give it to me.I waited, all attention in the classroom on the quiet    22  between teacher and student.When she finally   23  it over she whispered, “Okay, but I didn’t draw it”.
It was a hand-drawn    24   of me, teeth blackened and the words “I’m stupid” coming out of my mouth.I managed to fold it up calmly.My mind,    25  , was working angrily as I struggled not to   26  .
I figured I knew the two most likely candidates for drawing the picture.It would do them some   27  to teach them a lesson, and maybe it was high time that I did it!
Thankfully, I was able to keep myself   28  .
When there were about six minutes remaining, I showed the class the picture.They were all silent as I told them how   29  this was for me.I told them there must be a reason    30   and now was their chance to write down anything they needed to tell me.Then I let them write silently while I sniffed in the back of the classroom.
As I   31   the notes later, many of them said something like, “I’ve got nothing against you,” or “I’m sorry you were hurt.” Some kids said, “We’re   32  of you.” But two notes, from the girls who I   33 were behind the picture, had a list of issues.I was too   34 , too strict…
Reading those notes, I realized that over the course of this year, instead of   35  my students, I had begun commanding them to   36 .Where I thought I was driving them to success I was    37   driving them away.
I had some apologizing to do.But the next day in the classroom, one boy and one girl each handed me a card.The one   38    by all the boys expressed sincere regret for the ugly joke.The one from the girls asked for    39  .
This was a lesson for both the kids and me.Forgiveness does not change the past, but it does enlarge the    40  .
小题1:
A.noteB.adviceC.reasonD.help
小题2:
A.battleB.competitionC.argumentD.conversation
小题3:
A.tookB.thoughtC.turnedD.handed
小题4:
A.statueB.graphC.pictureD.poster
小题5:
A.otherwiseB.howeverC.thereforeD.besides
小题6:
A.leaveB.cryC.explainD.argue
小题7:
A.goodB.harmC.favorD.punishment
小题8:
A.amusedB.controlledC.uninterestedD.relaxed
小题9:
A.meaningfulB.forgetfulC.regretfulD.hurtful
小题10:
A.asideB.aboveC.beneathD.behind
小题11:
A.wroteB.finishedC.read D.collected
小题12:
A.proudB.fondC.afraidD.ashamed
小题13:
A.figuredB.promisedC.concludedD.confirmed
小题14:
A.talkativeB.meanC.clumsyD.considerate
小题15:
A.forcingB.encouragingC.comfortingD.teaching
小题16:
A.appreciateB.apologizeC.compromise D.achieve
小题17:
A.actuallyB.normallyC.immediatelyD.generally
小题18:
A.decoratedB.offeredC.signedD.bought
小题19:
A.thankfulnessB.forgivenessC.compensationD.communication
小题20:
A.friendshipB.educationC.knowledgeD.future
单项选择题