机电硐室的温度不得超过30°。

阅读理解。

     George Stephenson was born in 1781 in a poor family. He had to start work when he was only

eight. When George was fourteen, he became his father's helper. He spent a lot of time learning about

engineers (发动机). And on holidays he often made one engine to pieces and studies each piece

carefully. Soon he became a very good worker though he could not read or write. He began to learn

English letters when he was seventeen years old. Every day after he did twelve hours of hard work, he

walked a long way to have lessons from a young school teacher. On his eighteenth birthday, he wrote

his own name for the first time in his life. George invented (发明) many things in his life. The train was

the greatest one among them. Today when we take trains (火车) from one place to another, we'll think

of this great man ---George Stephenson.

1. He learned about the engine ______.

A. through reading and writing    

B. by making it to pieces and studying each piece carefully  

C. at lessons from a young teacher

D. by asking a lot of questions.

2. He spent a lot of time learning about engines and soon he became ______.

A. a great man    

B. a good maker      

C. a good worker  

D. a good student

3. George Stephenson invented ______.

A. the train    

B. the telephone    

C. the car      

D. the computer

4. From the passage we know George Stephenson was one of the greatest ______ in the world.

A. workers      

B. learners      

C. writers      

D. invertors (发明家)

5. Which is the best title (题目) for the passage?

A. The train

B. The Great Inventor

C. The story of George Stephenson's life

D. Engineer

AutoCAD中用ERASE(擦除)命令可以擦除边界线而只保留剖面线。

高能电子束的PDD曲线可大致分为以下几个区域（）。

A.剂量建成区、高剂量坪区、低剂量区

B.表面剂量区、低剂量坪区、剂量上升区

C.表面剂量区、剂量跌落区、低剂量坪区以及X射线污染区

D.表面剂量区、高剂量坪区、剂量跌落区以及X射线污染区

E.剂量建成区、高剂量坪区、剂量跌落区以及X射线污染区

●项目经理王某对其负责的系统集成项目进行了成本估算和进度安排，根据团队成员的情况分配了任务，并制定出计划执行预算成本的基准。由于公司高层领导非常重视该项目，特地调配了几名更有经验（薪水更高）的技术骨干参与项目，这种变化对项目绩效造成的最可能影响是__(33)__。

A．正的成本偏差CV，正的进度偏差SV

B．负的成本偏差CV，正的进度偏差SV

C．正的成本偏差CV，负的进度偏差SV

D．负的成本偏差CV，负的进度偏差SV

根据《房屋建筑和市政基础设施工程施工分包管理办法》（2014年修订）由（）提出工程项目施工分包计划申请，经批准后实施。

A.分包单位

B.施工单位

C.施工项目部

D.业主项目部