组成石油的烃类按其本身结构的不同可分为（）。A、2类 B、3类 C、4类 D、5类

阅读理解。

     A little girl thought she was not as beautiful as other girls, and nobody liked her. So she was always

unhappy and didn't like to talk to others. However, one day, her mother gave her a beautiful hair clip

(发夹). When she wore it, she looked much more beautiful than before. She decided to wear it to school. 

     On her way to school, she found that everyone smiled at her. Most of her schoolmates said "hello" to

her, but this never happened before. She thought that the beautiful hair clip had brought her them all. She

was so happy about all of the wonderful things. Although she didn't tell her classmates about her beautiful

hair clip, they all wanted to know what had happened to her.

     When she went back home after school, her mother asked her, "Did you know you dropped your hair

clip? I found it by the door this morning." She knew that she hadn't worn the hair clip to school at all.

     It is not important what we wear or how we look. The most important is how we think about

ourselves.

根据短文内容判断正(T)误(F)。

( )1. The little girl was not beautiful because she had no money to buy a hair clip.

( )2. Her mother didn't like the little girl, either.

( )3. Most of the schoolmates liked her beautiful hair clip very much on that day.

( )4. Her mother found the hair clip by the door after the girl went to school.

( )5. It is not important what we wear or how we look.

施工总承包模式与施工总承包管理模式的相同之处在于( )。

A．施工任务均由施工总承包单位或施工总承包管理单位完成
B．总包单位对分包单位的管理责任
C．业主对分包单位的付款方式
D．业主对分包单位的选择和认可权限

简述北洋政府立法活动的主要特点。

打开发动机反推包皮时要求每半边反推包皮至少装有几个反推格栅？（）

A、2个

B、3个

C、4个

D、5个

马赫数表指示什么信息（）.

A.飞机真空速与音速之比

B.飞机指示空速与音速之比

C.飞机当量空速与音速之比