化学纤维中线密度如何定义，请写出相应的单位？

阅读理解。

     More than 200 activities have been held so far during the Chinese Language Year in Russia. It has not

only made Chinese culture popular in Russia, but also improved understanding and friendship between

Russians and Chinese people. More and more Russians begin to enjoy Chinese food and operas, watch TV

programs to learn Chinese, and travel in China.

     Since the Chinese Language Year program in Russia started, so many events such as movie weeks,

operas, Chinese language classes, language contests (比赛) and teaching programs have been popular in

Russia.

     Through the activities, Russian people have had a chance to learn more about the Chinese culture.

Literature, history and its life today. For example, the first group of 500 Russian students visited the Chinese

cities of Beijing, Dalian and Qingdao. There they painted both countries' landmarks (界标), including the

Tian'anmen Square, the Great Wall, the Kremlin ( 克里姆林宫), the Volga River and the Red Square. When

the Russian students returned, they took part in a photo contest and a writing contest to show their love for

China.

     And Russians, especially young people, have become more and more interested in learning Chinese. To

date, more than 130 universities in Russia are offering Chinese courses. More than 20 middle and primary

schools have also taught Chinese as their first foreign language.

1.  __________ activities were held in the Chinese Language Year in Russia.

2. So many events __________ in Russia since the program started.

3. What have Russian people learnt from the activities?

    ________________________________________________________

4. How did the Russian students show their love for China when they came back? 

    ________________________________________________________

5. How many schools are having Chinese courses in Russia? 

   ________________________________________________________

已知集合A={-2，0，1，3}在平面直角坐标系中，点M（x，y）的坐标x∈A，y∈A．则点M不在x轴上的概率是______．

染色的人纤长丝府绸或细平布

最早提出近代主权学说的代表人物是( )

A．霍布斯

B．让·布丹

C．洛克

D．卢梭

执勤哨兵应当熟练掌握哪些处置情况的方法？