问题 单项选择题

22~25 疲劳计算按(GB50017—2003)第3.1.6条规定,采用1台吊车标准值,求最大弯矩时可将1台吊车轮压合力与邻近一轮的中线与梁中心线重合,如题 22~25图所示,在D轮下可得最大弯矩:

结构自重不计入。

当进行横向加劲肋下端主体金属疲劳计算时,因下端距梁下翼缘以上100mm,且焊缝不断弧,其修正后的应力幅计算值为()N/mm2,容许应力幅为()N/mm2

A.93.2,103

B.103,93.2

C.116.6,215

D.215,116.6

答案

参考答案:A

解析:

此处距中和轴84.5cm W=2138×103/84.5=2.53×104(cm3)

查《钢结构设计规范》表E,项次6属4类,按《规范》表6.2.3-2,

,可以。

多项选择题
完形填空
阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
On the first day of your Senior High you must meet many new classmates. Do you want to make friends with them? Do you know how to make friends with them? The following article will tell you how to do it.
Making friends is a skill. Like most skills, it improves      practice. If you want to meet people and make friends you must be      to take action. You must first go to places where there are people. You won’t make friends      at home alone. Join a club or group, for talking with those who      the same experience as you is easier, and      them in some activities.
Many people are      when talking to strangers. After all, meeting strangers means facing     , and it’s human nature to      a bit uncomfortable about the unknown.
Most of our fears about dealing with strange people      from doubts about ourselves. We      other people are judging us, thinking us too tall or too short, too this or too that.     , don’t forget that they must be feeling the same way. Try to accept yourself      you are, and try to put the other person at ease. You’ll      feel more comfortable.
Try to act self-confidently      you don’t feel that way      you enter a room full of strangers, such as a new classroom, walk straight, look      at other people and smile. If you see someone you’d like to     , say something. Don’t wait for the other people to      a conversation.
Just meeting someone      doesn’t mean that you will make friends with that person. Friendship is      on mutual(相互的)liking and “give and take”. It takes time and effort to develop. And there are things that keep a new friendship from growing.
小题1:
A.withB.onC.ofD.to
小题2:
A.ableB.sureC.certainD.willing
小题3:
A.lyingB.goingC.stayingD.leaving
小题4:
A.getB.haveC.makeD.like
小题5:
A.join inB.take part inC.joinD.enter
小题6:
A.afraidB.happyC.nervousD.familiar
小题7:
A.the newcomerB.the enemyC.the failureD.the unknown
小题8:
A.feelB.fallC.coverD.suffer
小题9:
A.bringB.comeC.getD.move
小题10:
A.find outB.believe inC.doubtD.imagine
小题11:
A.BesidesB.ButC.HoweverD.Therefore
小题12:
A.whatB.whoC.thatD.as
小题13:
A.allB.bothC.exactlyD.never
小题14:
A.even ifB.becauseC.so long asD.as if
小题15:
A.whenB.whileC.thatD.in which
小题16:
A.wellB.immediatelyC.highlyD.directly
小题17:
A.refer toB.loveC.speak to D.smile
小题18:
A.startB.stopC.showD.hold
小题19:
A.humorousB.newC.goodD.old
小题20:
A.dependedB.basedC.takenD.laid