TYJL-II型计算机联锁系统的电源系统的组成包括：（）、（）、（）、（）、（）。

阅读理解。

     Lily has a penfriend in America. Her name is Alice. They write to each other every week. They tell each

other about their lives. Here is a letter from Lily.

Dear Alice,

    Thank you for your letter and telling me about your best friend.In this letter,I'm going to tell you about my

friend.Her name is Cathy. She has long brown hair and blue eyes. She is the same age as me,but a little taller.

She is always happy. We sit together in class and help each other with our homework. We always play

together after school and play computer games for an hour. Cathy thinks quickly (迅速地) and does better

than me. She is learning to play the piano (钢琴).I am learning to play the piano,too.We play together every

day. It's fun. We always have a good time.

     Please write to me soon. 

                                                                                                                                                   Love, 

                                                                                                                                                   Lily

1. How often does Lily write to Alice? [ ]

A. Every two weeks.

B. Every week.

C. Every day.

D. Every three weeks.

2. Who is Lily's best friend? [ ]

A. She doesn't have one.

B. Cathy.

C. Alice.

D. Tommy.

3. What is Cathy's hair like? [ ]

A. Long and green.

B. Long and brown.

C. Short and brown.

D. Short and black.

4. When do they play computer games? [ ]

A. Before school.

B. At school.

C. After school.

D. At the weekend.

5. What other things do they do together every day? [ ]

A. Write letters.

B. Sing.

C. Play the piano.

D. Use the computer.

有20个工人看管机器台数资料如：25443434422434634524，如按以上资料编制分配数列应采用（）

A.单项式分组

B.等距分组

C.不等距分组

D.以上几种分组均可以

根据海水温度在垂直方向上的变化，海水有哪三层结构？

论述我国现行《婚姻法》增设无效婚姻、可撤销婚姻制度的必要性？

公司企业可以根据不同报表使用者的需要采取不同的编制基础、编制依据、编制原则和编制方法，分别编制并提供财务会计报告。( )