乳中掺水检测用全乳相对密度检测。

我国法定计量单位中，热力学温度的基本单位的符号是（）

A.k

B.kK

C.mK

D.K

E.μK

在使用PowerPoint 2000制作好幻灯片后，保存时______就可以使其能在PowerPoint 95或Power Point 97中正确阅读并编辑。

A．不用做特别的操作，利用软件本身的兼容性

B．选择PowerPoint 95格式保存

C．选择JPEG文件交换格式

D．打包

阅读理解

                                                 Linguistic(语言学的) Puzzles

     How did language begin? What was the world's first language? Do all languages come from one

original language?   1     .

      In the 4th century BC, the Greek historian Herodotus wrote this account: Psamtik I，an Egyptian

King, wanted to find out what the oldest language in the world was.    2    .He told his servant to find

two newborn babies.When the servant had found them, the king gave them to a shepherd (牧羊人)

and said,  “Keep these babies with the goats.Take care of them, but do not talk to them.Listen to any

words that they say.” The king wanted to find out what language the children would speak if they were

left alone.He said, “The first words they speak will come from the original language of the world.”

         3    . He told the king who asked his scholars about this word.They told him that the Phiygians,

who lived in an area which is now Turkey, called bread “becos”. The king said, “Then Phiygian is the

oldest language.” Today we know that the king's conclusion was wrong.We don't know why the children

said “becos”. 

      4  . Scholars discovered that many European and southern Asian languages belonged to the same

“family” and that they started from the same parent language, ProtoIndoEuropean.Linguists think that it

had split into several different languages, including Greek and Sanskrit, between 2000 and 1000 BC.

Other languages, such as English and Spanish, developed from later splits.

       5   . Two questions that interest linguists are: How does language change? Why does language

change? If you like solving mysteries, historical linguistics may be the job for you.

A. Nowadays, we study the origin of language more scientifically

B. He was talking about this problem with his scholars when he had an idea

C. The King was very kind to his servant and his servant remained royal to him

D. Linguists are the scholars who are very interested in categorizing the language families

E. People have been trying to find the answers to these questions for more than 2000 years

F. One day, while the babies were babbling to each other, the shepherd heard them say “becos”

G. Linguists have classified many language families, and they are still trying to categorize others

史记和汉书是研究汉代的重要文献，而近年出土的大批简牍更是汉代的珍贵史料。某生想了解汉代历史的概要，他应如何着手最为适当？

A．直接研读史记和汉书

B．研读、考订出土的汉代简牍

C．阅读史家综合文献和考古材料撰写的汉史著作

D．摘录几段汉代文献史料，进行研讨、分析

某电厂新建2X300MW国产亚临界燃煤机组，机组以发电机一变压器组单元接线接入220kV系统双母线，220kV配电装置采用双母线母联兼旁路母线接线方式，启动/备用电源由老厂110kV母线引接，主变压器中性点和启动/备用变中性点经隔离开关接地，根据系统需要可直接接地或不接地运行，发电机中性点经二次侧接有电阻的单相变压器接地，高厂变压器及启备变压器低压侧中性点经电阻接地，电阻为9.1Ω，400A。发电机次暂态电抗为16.01%。高压启动/备用变压器的中性点采用固定接地方式，主变压器中性点经隔离开关接地方式，高压厂用变压器及启/备变半穿越阻抗为21%，高压厂用变压器及高压启动/备用变压器均采用分裂绕组型变压器，高压厂用电设两段公用段及脱硫段，分别由机组高压厂用工作段供电。

关于发电机变压器组保护的出口动作方式，下列说法正确的是( )。

A．发电机定子接地保护，带时限动作于信号，也可动作于发电机减功率；
B．发电机定子绕组过负荷的反时限部分应动作于解列或程序跳闸；
C．发电机励磁回路一点接地、频率异常、励磁电流异常下降或消失等异常运行方式，保护动作于停机，宜采用程序跳闸方式；
D．发电机励磁绕组过负荷保护的反时限部分应动作于解列。
本工程发电机保护TA变比为15000/5A，5P20，发电机定子额定电流10190A，发电机次暂态电抗X_d"=16.01%，请根据上述已知条件回答下列有关定子绕组过负荷保护问题。