A.I~III
B. I~IV
C. II~IV
D. I、III、IV
第4题
根据上述信息,为了提高Strickland公司的灵活性,Halifax应采取下列哪项战略?
A.寻找削减成本、增加盈利能力的方法
B.调查提高资产效率的方法和周转率以提高流动性
C.增加Strickland公司对短期证券的投资以增加流动比率
D.为引入新产品寻求其它外部融资来源
第6题
(i)样本中最年轻的人多少岁?这个年龄的一家之主有多少人?
(ii)在模型中,β2的字面解释是什么?它本身有什么意义吗?
(iii)估计第(ii)部分中的模型,并以标准形式报告结果。你关心阿age的系数为负吗?请解释。
(iv)由于样本中最年轻者为25岁,若认为给定收入水平下,25岁时净总金融资产的平均量最低,这有意义吗?记得age对nettfa的偏效应为β2+2β3age,所以在25岁时的偏效应为β2+2β2(25)=β2+50β3,称之为θ2。求并得到检验H0:θ2=0的双侧P值。你应该得到θ2很小且在统计上也不显著的结论。
(v)由于反对H0:θ2=0的证据很弱,所以取之为0并估计模型
根据拟合优度,这个模型比第(ii)部分中的模型拟合的更好吗?
(vi)对第(v)部分中估计的方程,令inc=50(大致为平均值),画图给出nettfa和age的关系,但仅限于age≥25。描述你所看到的情况。
(vii)当方程中增加inc2时,验证它在统计上是显著的。解释你如何利用第(vi)部分和第(v)部分中的类似方法,估计nc对nettfa的影响严格递增。(提示:你需要求出样本中最低收入水平。)
第7题
B.①③④
C.①②④
D.①②③④
第8题
A、MAR和MDR
B、地址总线、数据总线
C、驱动器、译码器、读写电路
D、图中所有器件
第9题
A Bad Idea
Think you can walk, drive, take phone calls, e-mail and listen to music at the same time?
Well, New York&39;s new law says you can&39;t___ 46____ The law went into force last month, following research and a shocking number of accidents that involved people using electronic gadgets (小的机械) when crossing the street.
Who&39;s to blame? ___47____ "We are under the impression that our brain can do more than it often can, " says Rene Marois, a neuroscientist (神经科学家) in Tennessee. "But a core limitation is the inability to concentrate on two things at once."
The young people are often considered the great multi-taskers.___48____ A group of 18-to 21-year-olds and a group of 35- to 39-year-olds were given 90 seconds to translate images into numbers, using a simple code.___49 ____But when both groups were interrupted by a phone call or an instant message, the older group matched the younger group in speed and accuracy.
It is difficult to measure the productivity lost by multi-taskers. But it is probably a lot.
Jonathan Spire, chief analyst at Basex, a business-research firm, estimates the cost of interruptions to the American economy at nearly $650 billion a year ___50____ The surveys conclude that 28 percent of the workers&39; time was spent on interruptions and recovery time before they returned to their main tasks.
第46题__________ 查看材料
A.And you"ll be fined $100 if you do so on a New York City street.
B.Talking on a cell-phone while driving brings you joy anyway
C.The estimate is based on surveys with office workers.
D.The younger group did 10 percent better when not interrupted.
E.However, an Oxford University, research suggests this perception is open to question.
F.Scientists say that our multi-tasking (多任务处理) abilities are limited.
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