下列有关数据库的描述,正确的是( )。A.数据库是一个DBF文件 B.数据库是一

题型:单项选择题

问题:

下列有关数据库的描述,正确的是( )。

A.数据库是一个DBF文件

B.数据库是一个关系

C.数据库是一个结构化的数据集合

D.数据库是一组文件

考点:计算机等级考试VISUALFOXPRO计算机二级(VF)25
题型:单项选择题


Passage One

My First Experience with AIDS Patients
我初次接触艾滋病人

by Marc Kielburger
I was ushered to the AIDS ward of a hospice in the slum.I would later learn that the ward did not exist,at least not officially.Not a single person in Thailand had AIDS,according to the Thai government at the time.People got"sick,"of course,sometimes"very sick."but no one had AIDS.The hospice was home to an ever-growing number of"very sick"people.
I entered the ward and was greeted by two Thai nurses.
"Thank goodness you are here,Marc,"said the first.
"You’re a doctor,right "
I shook my head.
"So you are a medical student then!"
I shook my head again.
"But you know medicine,right "
"Kinda,"I offered."I watch E.R.,every Thursday"
After a rapid exchange in Thai,the first one said,"NO problem.Get ready for your fou- hour medical school training!"
"But in my country medical school takes years!" I protested.
"We don’t have that long," she replied. "So we better get started. "
During the next few hours, I learned to clean wounds, administer IVs, treat bedsores, and dispense medicine. The work was punishing, made worse by stifling heat, frequent blackouts, and an incredible stench in the air. I tried desperately to hide my weak nerves and queasy stomach, but more than once dashed for the bathroom to throw up.
Just when it seemed my training was coming to an end, the nurse took me aside. "There are only two more things you need to know," she said. "On the left-hand side of the ward, you will find what we call the Exit Area. " As it turned out, she meant "exit" in the largest sense of the word. Terminally ill patients were hidden behind a curtain and then exited out of the ward after death. "The second thing you need to know," she continued, "is that we haven’t had a day off in three weeks. You’ll be looking after the ward by yourself for the next shift. "
My jaw dropped.
"Don’t worry, Mare," said the other nurse, patting me on the shoulder before turning to leave. "Think of this as the beginning of your residency !" And with that, they walked out. Alone and petrified, I tried unsuccessfully to keep calm.
I counted to twenty-four. That’s how many AIDS patients were in my charge. What am I going to do I thought. What can I do I fell back on my training with the Canadian government and put my talents to work. I served patients water-some with ice, some without. Next, I tried to cheer up everyone, myself included, giving enthusiastic high-fives to patient after patient. Soon enough, everyone was laughing. Some were laughing with me, others most definitely at me, but I didn’t care. As long as I could keep people smiling, I was sure it would all be fine. And it was. Until a short while later, when a patient in the Exit Area began to choke. He had fluid in his lungs and could not breathe. As I crossed the floor, I could hear the man gasping for air. Fumbling and scared, I pulled back the curtain and administered the medicine the nurses had recommended. The man didn’t respond. With nothing left to offer, I sat down and held his hand, looking into his eyes as he breathed heavily for a while and then stopped. Watching him slip away, I was hit by a feeling of anguish such as I’d never felt, either before or since. It haunts me to this day.

Judging from the passage, what is the writer most likely to be

A.A doctor

B.A medical student

C.A volunteer

D.A government official

题型:单项选择题

下列变化前后的数据关系不符合a>b的是[ ]

A.一瓶浓硫酸溶质的质量分数为a,敞口放置一段时间后溶质的质量分数为b

B.常温下,将氢氧化钠和硝酸铵固体分别溶于水,两溶液的温度分别为a和b

C.将锌片放入质量为a的硫酸铜溶液中,一段时间后,溶液质量为b

D.酒精和水混合前的体积之和为a,混合后总体积为b

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简述教学中怎样培养学生思考问题的习惯。

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到2005年,“西气东输”工程将为上海送来30亿立方米天然气.天然气的主要成分是甲烷(CH4),它是一种“清洁能源”.甲烷在空气中完全燃烧生成二氧化碳和水,写出该反应的化学方程式:______.

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砌体工程冬期施工常用方法有()。

A.掺外加剂法

B.蒸汽加热法

C.冻结法

D.蓄热法

E.暖棚法

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