WCDMA系统R99协议的主要特点是（） A.引入新的无线技术 B.核心网络无根本性

我们已经知道，空气的主要成分是氮气和氧气．下图是测定空气中氧气含量的实验装置．试回答下列问题：

（1）实验过程中，燃烧匙里为什么要盛放过量的红磷？

______．

（2）这个实验除了可以得出氧气约占空气体积的1/5的结论外，还可推出氮气______（填“易”“难”）溶于水和其化学性质______（填“活泼”“不活泼”）的结论．

（3）在此实验过程中能否用碳、硫代替红磷？______．

His eyes nearly in tears from the crush of fellow travelers at Guangzhou's train station, Hong Tao said things were much better on Sunday, after days of waiting for a train to his home in Hubei province.

"I think it's fine today, and everything is going smoothly," the 28-year-old said. "I thought it would be really crowded but it has turned out to be OK."

Chinese authorities say they expect 1.3 million people to travel out of Guangzhou's train station over the next few days, as they rush to get home by Wednesday, the eve of Lunar New Year.

Hong's optimism may have been helped by the blue skies that emerged over Guangzhou on Sunday for the first time in a week.

Last week, a rare winter storm paralyzed China's transportation system as millions tried to get home to celebrate the holiday — the only chance for many migrant workers to see their families all year.

China's state-run Xinhua news agency said Friday that 95 percent of rail traffic had "returned to normal." But Guangzhou's train station remained packed with a backlog of hundreds of thousands of travelers hoping to get home for the holiday.

A young woman was stepped on in a stampede (人群蜂拥) at the train station Friday, and later died of her injuries, according to Xinhua. Video of the situation on Friday showed crowds of people screaming, elbowing each other, in some cases sobbing and collapsing in the rush to get a slot (狭缝，窄孔) on a train.

China Sunday announced it has organized over 300,000 People's Liberation Army forces to southern China in what it described as a "war on winter weather".

The government also announced a $700 million plan to help farmers whose crops have been destroyed.

6. How many days is it from the day this article was made to the Lunar New Year?

A. Two days.         B. Three days.               C. Four days.         D. Five days.

7. What can we know about the weather condition of last week in Guangzhou?

A. Sunny with blue sky.               B. Rainy for a whole week.

C. Heavily snowy.                       D. Rainy first and snowy now.

8. Why are there so many passengers in Guangzhou’s train station?

A. Because the heavy snow stopped the passengers from leaving the station.

B. Because the passengers didn’t hope to leave the station right now.

C. Because the passengers hoped to leave for their hometown.

D. Because the holiday was coming near.

9. Where is Hong Tao from?

A. Shandong province.                B. Hubei province.

C. Guandong province.                      D. Not mentioned.

10. What can we infer from the passage?

A. On Friday, a young man was dead because of crowds’ elbowing, screaming.

B. China’s Government have arranged the PLA forces to help.

C. The government of China have offered money to help farmers enjoy the new year.

D. Many crops have been destroyed by the crowds of people.

照片影像仅在某一部分出现模糊，可能性最大的是（）.

A.检查床颤动

B.暗盒漏光

C.屏一片接触不良

D.患者移动

E.摄影时间长

砂浆分层度值是用来衡量砂浆运输和使用时的保水性能的好坏，分层度值愈大，砂浆保水性愈好，反之亦然。（）

国家发展专业技术人员继续教育公共服务事业的原则是（）

A.市场调节

B.政府主导

C.银行投资

D.社会参与