乳腺数字摄影X线机摄影系统用平板探测器代替（） A.滤线器 B.暗盒仓 C.摄影平台

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

在一个心动周期中，动脉血压的最高值称

A．孕激素
B．人绒毛膜促性腺激素
C．雄激素
D．促性腺激素释放激素
E．促卵泡激素释放蛋白

装设在双作用压缩机气缸内的扁平圆盘形或扁平圆柱形的是（）活塞。

A.筒形

B.盘形

C.级差式

D.柱塞

某公司召开董事会议，对研究开发部提出了目标要求，即研究开发部提出了目标要求，即研究开发部经过努力必须在一定时期内为公司各关键市场推出具有较高市场份额的产品。对于这一要求，你认为下列评价中哪种更有道理？（）

A.时间不明确，在实践中缺乏操作标准

B.关键市场的提法不具体，很难界定范围

C.较高市场份额的标准不清楚，要详细说明

D.应综合考虑上述意见所反映的问题

人民法院在审理行政案件中，对行政机关应予处罚而没有处罚的（）。

A、可以直接给予处罚

B、不能直接给予处罚

C、可以命令行政机关给予处罚

D、可以和行政机关一起作出行政处罚