（5a3-4a2+3a）÷a=______．

根据疾病诊断的需要，灵活选用窗宽、窗位。颅脑CT图像常用脑窗摄影，窗宽80～100Hu，窗位35Hu左右。颅底、内听道病变；颅脑外伤；颅骨病变或颅内病变侵犯颅骨，必须加摄骨窗。骨窗的窗宽1000～1400Hu，窗位300～500Hu。耳鸣及怀疑桥小脑角区病变者，应调节窗口技术，以观察内听道有无扩大，并根据需要对局部进行放大。头皮下软组织病变，用软组织窗摄影：窗宽300～400Hu，窗位35～45Hu。根据不同的部位和病变灵活选用窗宽和窗位。若病变与周围组织密度接近时，可适当调窄窗宽；若伪影较多或需观察局部组织的丰富层次，可调低窗位，并适当调宽窗宽。鞍区CT图像常用软组织窗和骨窗，软组织窗的窗宽350～400Hu，窗位35～40Hu。

下列对颅脑CT后处理技术应用的叙述正确的是（）

A.颅脑CT图像常用软组织窗摄影

B.观察脑时用窗宽80～100Hu，窗位35Hu左右

C.骨窗的窗宽1500～2000Hu，窗位300～500Hu

D.观察软组织时用窗宽400～500Hu，窗位30～60Hu

E.怀疑桥小脑角区病变者用窗宽80～100Hu，窗位35Hu左右

试题二(20分)阅读下列说明，回答问题1至问题4，将解答填入答题纸的对应栏内。[说明]系统集成商A与生产型企业B签订了一份企业MIS(管理信息系统)开发合同，合同已执行到设计和开发阶段，由于企业B内部组织结构调整，可能会影响核心业务的流程。集成商A提出建议，合同暂停执行至新的组织结构确定之后。双方经过会议协商和沟通，同意上述建议，后续工作再另行协商确定。6个月后，企业B组织结构基本确定，要求继续执行合同，并表示可将工期延后6个月。但集成商A原来参与项目的部分人员离职，新的项目组成员对该项目不熟悉，通过仔细阅读原来的需求文件还是无法完全理解MIS系统的需求。同时，由于企业B组织结构的调整导致原需求发生了较大变化，因此不得不重新进行所有的需求调研。项目继续开展了1个月后，集成商A提出需要增加合同费用，理由是新的需求导致工作量增加，软件系统需要重新开发。但企业B认为需求变更是正常的，集成商A之所以工作量增加也是由于原来的项目文档保留不完整，并且人员更换等原因造成的。双方未就合同变更达成一致，陷入僵局。随后，企业B考虑是否使用法律手段来解决纠纷，但发现整个合同执行过程的备忘录和会议记录都没有，无法提出直接的证据材料。

[问题2](8分)请结合案例分析集成商A在项目管理方面存在的问题。

Windows基础操作题
(1)在D盘根下建立TL文件夹，在TL文件夹下建立AA子文件夹和BB子文件夹。
(2)查找CALC.EXE文件，将CALC.EXE文件复制到AA中。
(3)将AA中CALC.EXE文件改名为JS.EXE。
(4)将CC文件夹直接删除，不放入回收站中。
(5)将AA中JS.EXE的属性设置为只读。

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中的两项为多余选项。

     Nobody has ever succeeded in their attempt to stay young and live a very long life. 1_____ But is this

really true?

     Dr Aubrey de Grey thinks that we can stop people getting old and that in about 20 years, people will

be able to live to be 1,000 years old! 2_____    

     In Dr Grey's opinion, getting old is a problem that can be solved. 3_____ If we can cure this disease,

we can stop the aging process. We can also make people have young bodies again.

     Dr Grey believes that science will soon be able to stop the causes of aging so that a person's body

won't get weak and won't suffer from the typical diseases of old age.

     Dr Grey compares the human body to a house. As the house gets older, some things must be repaired.

Broken hearts must be replaced. The same thing can happen with the human body, he thinks. We can use

stem cell technology to grow new, healthy tissue to replace the old, damaged one. We can also try to remove

disease-causing molecules in our bodies. 4_____. 

     5_____ However, they admit that Dr Grey's ideas have not yet been proved wrong. Dr Grey is convinced

that his opinions are realistic and that his research is very important. If aging is a disease, he says, we must

try to cure it.

A. At the same time, people's bodies will stay young and healthy.

B. Scientists succeed in solving the problem of aging long ago.

C. A lot of scientists think his ideas not realistic.

D. When our bodies change as we get older, this is like a disease.

E. New deadly diseases may also be cured, if we can stop the aging process.

F. It seems that everybody must get old and die.

G. In this way, a person could easily live to be 1,000 years old.

可以用来改善注意力分散的方法中不包括（）。

A.早睡早起

B.自我减压

C.放松训练法

D.暴露法