一个电阻两端的电压为3V时,通过它的电流为1A,当将其两端电压增加到9V时,电阻

题型:选择题

问题:

一个电阻两端的电压为3V时,通过它的电流为1A,当将其两端电压增加到9V时,电阻消耗的电功率比原来增加了(  )

A.3W

B.9W

C.12W

D.24W

考点:欧姆定律及其应用电功率的计算
题型:选择题

旅游法所调整社会关系,其中下列各项中哪项是最主要的。()

A.旅游管理之间关系

B.旅游行政管理部门与旅游企业间的关系

C.旅游企业之间的关系

D.旅游者与旅游企业间的关系

题型:选择题

阅读理解。

     Readers Digest在网上公布了2008年Hero 的候选人的事迹。

     A. After the September, 11 Event, Rossmiller began to identify would-be terrorists in e-mail exchanges. So far, she has tracked down a few arms dealers. Faced with death threats, the mother of three says,

"With anything important, you have to take risks."

     B. "Stop them!" a passer-by yelled. "They stole a lady's purse!" Kevin Croskey ran after two young

men. One of the teenagers pulled a weapon. He threw himself on the kids and sent them to the police

station.

     C. In 2003, Mark and three other family members started to clean up the worsening bay in California. So far, they've poured $100,000 of their own money into this campaign and enlisted 1,100 others to try to return the bay to a safe, clean environment.

     D. A tornado struck a nursery school in Alabama and trapped teachers and kids in the game area.

Minutes later, Justiss and a line of gathering volunteers rushed into the area and saved 31 kids they knew

nothing about.

     E. Phillips searched for five years before she finally found her missing sister. In the process, she learned more about the missing people and their family members and founded a website to assist people looking

for loved ones.

     F. A man was lying on the sidewalk, wildly kicking at two dogs which were biting him. Griggs stopped his car and grabbed a pipe on the ground. A direct blow made the male dog flee. Then Griggs used the

pipe to strike the female dog until she left. Next he helped to carry the man to the hospital.

请阅读以下人员的信息,与他们所选的Hero 进行匹配:

1. Pearce is a magazine editor, responsible for providing information for those who searched for their relatives and friends. She appreciated the hard work people paid to get the lost one back.

2. Pickering insists all men are becoming colder, minding their own business. He thinks a hero should be the one who helps strangers out of trouble at the cost of his own life.

3. Fiona recently witnessed a theft but was not brave to stop it. She admired those with courage in face of a criminal.

4. Eliza started her own business with little money and suffered several severe failures. But she made herself on the Rich List, insisting that nothing is impossible if we take risks.

5. Higgins works for a hospital. In his spare time, he volunteers to do something to develop the environment-conscious public. He believes it is everyone's duty to treasure our earth.

1. ________   2. ________   3. ________   4. ________   5. ________

题型:选择题

世界上出产和输出石油最多的地方是(  )

A.中东

B.墨西哥

C.英国

D.俄罗斯

题型:选择题

评价医德行为善恶的根本标准是()

A.患者的个人意见

B.患者家属的意见

C.新闻媒体的认定

D.有利于患者康复、有利于医学发展、有利于人类生存环境的改善

E.社会主义医德规范体系

题型:选择题

一号线地铁列车滤波电抗器绝缘等级()级。

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