集散控制系统又称分散控制系统，它是以微型计算机为基础的，将显示操作部分高度集中，而将

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 engines（发动机）．And on holidays he often made one engine to pieces and studied 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 from one place to another，we'll think of this great man---George Stephenson．

小题1:In which year did George Stephenson start to help his father？________．

A．In 1781

B．In 1789

C．In 1795

D．In 1798小题2: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小题3: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小题4:George Stephenson invented the ________.

A．the train

B．the telephone

C．the car

D．the computer小题5:From the passage we know George Stephenson was one of the greatest ____ in the world．

A．workers

B．writers

C．learners

D．inventors

水是宝贵的自然资源，水资源不足，将严重影响人类的生存．

（1）无论是自来水还是纯净水，保持水的化学性质的最小粒子是______．

（2）小磊对水进行了下列实验，其中能确定水由氢元素和氧元素组成的是______（填标号）．

a．蒸发      b．电解     c．沉淀      d．吸附

（3）自然界中的水净化为生活饮用水，可以通过加入絮凝剂凝聚、沉降，然后通过______（填操作名称）而实现；要杀灭细菌可以向水中加入消毒剂，也可以通过______操作，既杀灭细菌，又能得到几乎纯净的水．测得某水样的PH=6.6，则该水样呈______性（选填“酸”、“中”或“碱”），生活中区分硬水与软水用______．

（4）为了保护水资源，说说你在生活中节约用水的具体做法：______．

治疗外科低血容量性休克的基本措施是补充血容量，一般宜首选（）

A.平衡盐溶液

B.10%葡萄糖溶液

C.右旋糖酐

D.5%碳酸氢钠

E.全血

二战后，教育制度发展趋势之一是普通教育与朝着相互渗透的方向发展。( )

A．职业教育

B．特殊教育

C．义务教育

D．社会教育