在PID工艺流程图中（）表示工艺气。A.PA B.PL C.PG D.PW

连续传播造成的流行或暴发的特点是（）

A.全部病例在一个最长潜伏期内

B.发病曲线突然升高，很快下降

C.有一个流行高峰

D.病例分批出现，可以划分成代

E.流行曲线一般不留拖尾现象

臂丛内、外侧束共同形成的神经是（）。
臂丛内侧束的分支是（）。
臂丛后束的分支是（）。
臂丛外侧束的分支是（）。

A.肌皮神经

B.尺神经

C.腋神经

D.胸长神经

E.正中神经

阅读理解

     New archaeological discoveries suggest that trade between Europe and Asia along the Silk Road

probably began in some form many centuries earlier than once thought. The findings, coupled with a

widening range of scientific and historical research, could add a fascinating new page to the epic of the

Silk Road.

     The latest and most surprising discovery is pieces of silk found in the hair of an Egyptian mummy from

about 1,000 BC, long before regular traffic on the Silk Road and at least one thousand years before silk

was previously thought to be used in Egypt. Other research may extend human activity along this route

back even further, perhaps a million years to the migration of human ancestors into eastern Asia.

     The official origin of EastWest commerce along the road is usually placed in the late 2nd century BC

when an agent of the Chinese Emperor Wudi returned from a dangerous secret mission (使命) across

the western desert into the remote high country of Central Asia. The agent, Zhang Qian, travelled as far

as Afghanistan and brought back knowledge of even more distant lands such as Persia, Syria and a place

known as Lijien, perhaps Rome. Historians have called this one of the most important journeys in ancient

times. His journey opened the way for what have been thought to be the first indirect contacts between

the ancient world's two superpowers, China and Rome. Chinese silk, first traded to central Asian tribes

for war horses and to the Parthians of old Persia in exchange for acrobats and ostrich eggs, was soon

finding its way through a network of merchants to the luxury markets of Rome.

     But the new discoveries show that Chinese silk was apparently present in the West long before the

Han emperor started organized trade over the Silk Road. The research could change thinking about the

early history of world trade and provide insights into the mystery of just how and when Europe and the

Mediterranean lands first became aware of the glorious culture at the other end of Eurasia.

1. The word "coupled" in the first paragraph could best be replaced by ________.

A. produced  

B. continued

C. doubled  

D. combined

2. The silk thread found in the hair of an Egyptian mummy suggests that ________.

A. Egyptians had probably travelled to China to buy silk

B. trade along the Silk Road began earlier than once thought

C. historical research often achieves fascinating results

D. new light can now be thrown on ancient trading practices

3. Until recently most historians believed that trade along the Silk Road ________.

A. originated in the 2nd century BC

B. extended human migration into eastern Asia

C. began a million years ago

D. primarily benefited the Egyptians

4. Historians have always considered Zhang Qian's mission important because they believe ________.

A. he brought back knowledge of Rome to the emperor

B. he discovered the Silk Road

C. he helped establish EastWest trade

D. he travelled as far as Afghanistan

桥式起重机按功能分为三大部分()。

A、起升部分、大车部分、小车

B、司机室部分、移动部分、固定部分

C、金属结构部分，机械部分，电气部分

当电源电压与负载有功功率一定时，功率因数越高，线路的压降（）。