1955年4月，万隆会议在印度尼西亚的万隆召开，参加这次会议的国家主要来自[ ]

A、B、C、X均为中学化学常见的纯净物，它们之间有如下转化关系（副产物已略去）。

试回答：

（1）若X是强氧化性单质，则A不可能是       （填字母）。

a．S     b．N₂     c．Na     d．Mg     e．Al

（2）若X是金属单质，向C的水溶液中滴加AgNO₃溶液，产生不溶于稀HNO₃的白色沉淀，则B的化学式为       ；在贮存C溶液时应加入少量X，理由是                       （用必要的文字和离子方程式表示）。

（3）若A、B、C为含有金属元素的无机化合物，X为强酸或强碱，A溶液与C溶液反应生成B。反应①的离子方程式可能为                               或                       。

The Vikings have left many traces of their settlement which are still visible today. Archaeology provides physical evidence of their conquests, settlement and daily life. The study of place names and language shows the lasting effect which the Viking settlements had in the British Isles, and DNA analysis provides some insights into the effect the Vikings had on the genetic stock of the countries where they settled. All of this provides valuable information, but the only reason that we have an idea of the "Vikings" as a people is their appearance in the written sources.
Unfortunately, the value of the written evidence is limited. Not a lot of evidence survives, and much of what we have is either uninformative or unreliable. Many popular ideas about Vikings are nineteenth-century inventions. Others are the result of early historians accepting sources which modern scholars now regard as completely unreliable. In Scandinavia the Viking Age is regarded as part of prehistory because there are practically no contemporary written sources. Even in western Europe, the Viking Age is often seen as part of the "Dark Ages", from which comparatively few historical records have survived.
Surviving accounts of Viking activity were almost exclusively written by clergymen (神职人员). These monastic chronicles (编年史) outline broadly what happened, at what date. There are also sources of a more directly religious nature, such as the much-quoted letters of Alcuin, and Wulfstan’s famous "Sermon of the Wolf ", both of which chose to interpret the Viking raids as God’s punishment on the Anglo-Saxons for their sins. Even the chronicles reflect the fact that the Vikings often attacked monasteries for their wealth, which created an obvious bias against them, and the hostile tone of these contemporary accounts has done much to create the popular image of Viking atrocities. However, modern historians have noted that the same sources show Christian rulers behaving equally unpleasantly, but without being condemned on religious grounds.
We tend to think of the Vikings as a race of Scandinavian warriors, but the reality is more complex. Raids on the British Isles and the coasts of France and Spain were the work of Vikings from Norway and Denmark. The word Viking means one who lurks in a "vik" or bay, in effect, a pirate.
The word "Viking" has come to describe a whole new age in Europe between about 800 and 1150. This is despite the fact that Vikings were not just pirates and warriors but also traders and colonists. But at the start of the Viking Age in the last decade of the 8th century, loot and adventure were the main goals of the Norwegians who raided in Scotland and Ireland and of the Danes who attacked England. Gold and silver treasures accumulated by the great monasteries could be converted into personal wealth and thus power, and captives could be sold as slaves. What better way for the young sons of good families to earn their way and see the world

The reason why the Viking Age is regarded as part of the "Dark Ages" is that ______

A．people at that time were often attacked for their wealth by the Vikings

B．living conditions for both the Vikings and the Europeans were terrible

C．the contemporary historians are practically in the dark about the Vikings

D．Viking Age is a part of prehistory

胫骨前肌（）

A.使踝关节背伸、足内翻

B.使踝关节跖屈、足外翻

C.使踝关节跖屈、足内翻

D.使膝关节屈曲、踝关节屈曲

E.使髋关节屈曲、膝关节屈曲

沥青混合料的技术性能主要有（）（）（）（）（）

由发动机、（）、电气系统、工作操纵装置和车身等部分组成机动车。

A.传动系、行驶系、转向系

B.机械系、控制系、点火系

C.润滑系、控制系、点火系

D.电力系、液压系、气动系