风景林是风景名胜区的重要组成部分，以供欣赏和审美，游客要支付门票费用。请判断风景林属

按照《建设工程工程量清单计价规范》规定，工程量清单()

A、必须由招标人委托具有相应资质的中价机构进行编制

B、应作为招标文件的组成部分

C、应采用工料单价计价

D、由总说明和分部分项工程清单两部分组成

在研究导体中的电流与导体的电流与导体电阻的关系实验中，如图是实验电路图．

（1）实验过程中，把电阻R由5Ω换成10 Ω、20 Ω，每次闭合开关后，首先应调节滑动变阻器，使 _________ 保持不变，然后再记录 _________ 的示数．

（2）如表是实验测得的三组数据，由此得到的结论是 _________ ．

（3）在许多实验中都需要多次测量，有的是为了找到普遍的规律，克服偶然性；有的是为了取平均值以减小误差．本实验中的多次测量是为了_________．

有下列二叉树，对此二叉树前序遍历的结果为( )。

D

Love, success, happiness, family and freedom—how important are these values to you Here is one interview which explores the fundamental questions in life.

Question: Could you introduce yourself first

Answer: My name is Misbah, 27 years old. I was born in a war-torn area. Right now I’m a web designer.

Q: What are your great memories

A: My parents used to take us to hunt birds, climb trees, and play in the fields. For me it was like a holiday because we were going to have fun all day long. Those are my great memories.

Q: Does your childhood mean a lot to you

A: Yes. As life was very" hard, I used to work to help bring money in for the family. I spent my childhood working, with responsibilities beyond my age. However, it taught me to deal with problems all alone. I learnt to be independent.

Q: What changes would you like to make in your life

A : If I could change something in my life, I’ d change it so that my childhood could have taken place in another area. I would have loved to live with my family in freedom. Who cares whether we have much money, or whether we have a beautiful house It doesn’t matter as long as I can live with my family and we are safe.

Q: How do you get along with your parents

A : My parents supported me until I came of age. I want to give back what I’ ve got. That’ s our way. But I am working in another city. My only contact with my parents now is through the phone, but I hate using it. It filters(过滤) out your emotion and leaves your voice only. My deepest feelings should be passed through sight, hearing and touch.

What did Misbah desire most in his childhood（）

A. A colorful life.

B. A beautiful house.

C. Peace and freedom.

D. Money for his family.

半封闭式活塞压缩机的密封面的连接方式为：（）。

A.整体机壳，无密封面

B.焊接

C.铆接

D.螺栓连接