问题 问答题 简答题

为什么仅用天然含水量说明不了粘性土的物理状态,而用液性指数却能说明?(长安大学2007年硕士研究生入学考试)

答案

参考答案:

对于粘性土,因粘土矿物含量高、颗粒细小,其物理状态与含水量关系非常密切。同一种粘性土随其含水量的不同,而分别处于固态、半固态、可塑状态及流动状态。但是由于含不同矿物成分的粘性土,即使具有相同的含水量,也未必处于同样的物理状态,因为含不同矿物成分的粘性土在同一含水量下稠度不同。在一定含水量下,一种土可能处于可塑状态,而含不同矿物颗粒的另一种粘性土可能处于流动状态。因此,考虑矿物成分的影响,粘性土的软硬状态不用含水量直接判断。

阅读理解

阅读理解。

  It is Sunday today. Tom is lying in bed. It is eight-thirty. He doesn't want to

get up.  His father is watering the flowers(浇花).  His mother is cooking

breakfast. His sister is doing her homework.

  "Get up,  Tom. "  says his mother,  " Go to help your dad. " Tom  has to

leave the bed, but he finds a math book in his bag. He stdrts to read loudly. "

Three times (乘)  five is fifte.en,  three times six is six-teen. . . " His mother

hears this and  becomes  angry (生气).   She  asks," What are you reading,

Tom?"  "I don't know. "  " Aren't you reading?"" Yes,  I am, " answers the boy.

" But I am not listening ! "

1. There are _____ people in Tom's family.

A. two      

B. three      

C. four          

D.five

2. The family are all busy except(除…以外_____.

A. Tom      

B. Tom's si    

C. Tom's father      

D. Tom's mother

3. Tom doesn't want to get up because          .

A. it is very early              

B. he is very tired

C. he has no homework            

D. he doesn't need to go to school

4. _____, so he begins to read the book.

A. Tom doesn't want to get up to help his father

B. Tom doesn't want to help anyone

C. Tom likes reading very much

D. Tom likes to study math very much

5. Tom's mother is angry because _____.

A. her son doesn't go to help his father

B. what her son is reading is not right

C. her son is reading a math book

D. her son doesn't listen to her

单项选择题