问题 多选题

如图所示,一轻质弹簧一端系在墙上的O点,另一端栓住一小物块,弹簧自由伸长时刚好到达B点.今用小物块把弹簧压缩到A点,然后释放,小物块运动到C点时速度为零.物块与水平地面间的动摩擦因数恒定.下列说法正确的是(  )

A.物块从A到B速度越来越大,从B到C速度越来越小
B.物块从A到B速度越来越大,从B到C加速度增大
C.物块从A到B先加速后减速,从B到C一直做减速运动
D.物块从A到B加速度先减小后增大,从B到C加速度一直增大

答案

A、B、C物体竖直方向受到重力与地面的支持力平衡,水平方向受到弹簧的弹力和滑动摩擦力.从A到B过程中,弹簧的弹力水平向右,摩擦力水平向左,弹簧的弹力先大于摩擦力,后小于摩擦力,故物体先加速后减速,从B到C过程,摩擦力和弹簧的弹力方向均向左,物体一直做减速运动.故AB错误,C正确.

D、物体在AO间某点合力为零,故物体从A到B加速度先减小后增大,从B到C加速度一直增大,所以D正确.

故选CD.

阅读理解

As a boy growing up in India,I had longed to travel abroad. I used to listen to the stories my father would tell me about his stay in Canada and tours to Europe in the 1970s’ with great interest.

My big moment finally came in the summer of 1998 when I was able to accompany my parents to Europe,where my father was to attend a meeting. We planned to travel to Belgium,Netherlands and West Germany.

I have vivid memories even today of going to Mumbai airport at night all excited about finally going abroad. I had heard several great things about Lufthansa till then but now I finally got to experience them first hand during the flight to Frankfurt. We flew business class and even today I can remember the excellent service by the Lufthansa crew. The flight was really smooth and thoroughly enjoyable,even for someone like me,who is otherwise scared of flying.

After spending almost two weeks in Europe,we took the Lufthansa airport express from Dusseldorf to Frankfurt airport for our return flight. What a journey that was! All along the Rhine (莱茵河),it was simply an unforgettable experience. I was in a sombre mood on the flight back to Mumbai as it marked the end of a wonderful vacation,but the Lufthansa crew members were able to change it into a most enjoyable experience yet again,with the quality of their service.

Being the first airline to take me overseas,Lufthansa will always hold a special place in my heart. Even today,I continue to enjoy flights on Lufthansa and simply cannot dream of choosing any other airline. Flying,in general,for me,has always been an ordeal (terrible and painful experience).Flying on Lufthansa,however,is something I always have and always will look forward to.

小题1:Which country does the author live in now?

A.India.

B.Canada.

C.Belgium.

D.Germany.小题2:What made the author so interested in traveling abroad?

A.Growing up in India.

B.Once staying in Canada.

C.Once traveling to Canada with his father.

D.His father's stories about his traveling experiences.小题3:Which of the following is TRUE about the author's trip to Europe in 1998?

A.The author traveled with one of his parents.

B.Both their going and return were by air.

C.They traveled in spring that year.

D.They stayed in Europe for nearly two months.小题4:It can be inferred from the passage that Lufthansa is ________.

A.a city in India

B.a city in Europe

C.an airline company

D.a travel agency小题5:The underlined word “sombre” in the 4th paragraph probably means “________”.

A.happy

B.sad

C.angry

D.enjoyable

单项选择题

根据案例,回答问题:
飞龙公司于2000年成立,其主要业务是生产并对外出口各种玩具。公司的总资产为5000万元,其中包括4座总价值1000万元的厂房,目前正在使用。公司要在新开发区中建设新厂房,此项工程已经开工,并将于2010年底完工。公司投保了企业财产保险综合险、机器损坏保险和利润损失保险。
公司于2007年购买了一批广州本田车,每辆价值25万元。在购买这批车时,公司为每辆车都办理了车辆损失险和全车盗抢险。
2009年飞龙公司在非洲A国投资200万美元建厂,为预防政治风险损失,及时向某保险公司投保投资保险,保额为投资额的80%。
飞龙公司有员工1000多名,其中包括了年轻力壮者和年迈多病者。2006年初,公司为全体员工购买了团体人寿保险、团体人身意外伤害保险附加停工保险。约定停工保险的责任期限的终止日为保险合同结束后的1个月。为了转移因雇员的不诚实行为而使公司遭受损失的风险,公司还投保了雇员忠诚保证保险。
公司老板龙某为其重要雇员张三投保了雇主责任保险,期限为二年。张三的年薪为12万元,因其工作有可能会危及他的人身健康,保单规定死亡和伤残的最高赔偿限额分别为36个月和48个月的工资,并有5天的免赔额的规定。

飞龙公司2007年毛利润率为30%,2008年3月发生保险事故导致营业中断。2007年度同期的标准营业额为30万元,赔偿期的营业额为10万元,则营业额减少所致的毛利润损失为( )万元。

A.6
B.8
C.9 D.30