问题 单项选择题

均质细直杆OA长为ι,质量为m,A端固结一质量为m的小球(不计尺寸),如图4-76所示。当OA杆以匀角速度ω绕O轴转动时,该系统对O轴的动量矩为()。

A.

B.

C.mι2ω

D.

答案

参考答案:D

完形填空
Life is filled with challenges. As we get older we 26 realize that those challenges are the very things that  27  us and make us who we are, it is the same with the challenges that come with  28 .                                                   
When we are faced with a challenge, we usually have two  29 : we can try to  30  it off, or we can decide that the thing presenting the challenge isn’t worth the  31  and call it quits. Although there are  32  times when calling it quits is the right thing to do, in most  33  all that is needed is commitment and  34 .
When we are devoted to  35 , it means that no matter how  36  or how uncomfortable something is, we will always choose to  37  it instead of running away from it. Communication is making a  38  for discussion and talking about how you feel instead of just saying what the other person did wrong.  39  you can say to a friend, “I got my feelings hurt.”  40  “You hurt my feelings,” you are going to be able to solve the problem much faster.
In dealing with many challenges that friendship will bring to you, try to see them for  41  they are: small hurdles(障碍) you need to jump or  42  on your way through life. Nothing is so big that it is impossible to get over, and hurt only  43  to make us stronger. It’s all part of growing up, it happens to everyone, and some day you will  44 on all of this and say, “ 45  as it was, it made me who I am today. And that is a good thing.”
小题1:
A.seem toB.come to C.hope toD.try to
小题2:
A.designB.promoteC.directD.shape
小题3:
A.successB.pressureC.friendshipD.difficulty
小题4:
A.opportunitiesB.expectations C.choicesD.aspects
小题5:
A.beatB.showC.takeD.fall
小题6:
A.commentB.lossC.troubleD.expense
小题7:
A.hardlyB.certainlyC.consequently D.exactly
小题8:
A.issuesB.casesC.eventsD.affairs
小题9:
A.communicationB.confidence C.courage D.consideration
小题10:
A.everythingB.anythingC.somethingD.nothing
小题11:
A.doubtfulB.shamefulC.harmfulD.painful
小题12:
A.keepB.controlC.faceD.catch
小题13:
A.chanceB.planC.topicD.room
小题14:
A.IfB.AsC.WhileD.Unless
小题15:
A.other thanB.rather thanC.or ratherD.or else
小题16:
A.whatB.whoC.whereD.which
小题17:
A.pass byB.come across C.get throughD.run over
小题18:
A.servesB.meansC.aimsD.attempts
小题19:
A.look intoB.look forC.look outD.look back
小题20:
A.InterestingB.SurprisingC.Complicated D.Hard
判断题