如图所示,用电压表测灯L1 两端的电压,正确的是[ ] A. B. C. D.

题型:选择题

问题:

如图所示,用电压表测灯L1 两端的电压,正确的是[ ]

A.

B.

C.

D.

考点:电压的测量,电压表的使用
题型:选择题

D

Have you ever thought, “I wish I could take a year off and just travel around the world”? Well, three lucky American teenagers were able to do just that. The teens—two males and one female--got an all-expenses paid, yearlong hike to five continents.

This trip didn’t include any five-star hotels or shopping funs. Eighteen-year-old Jamie Fiel from Keller, Texas, 17-year-old Arsen Ewing from Canyon, California, and 16-year-old Tyler Robinson from Lincoln, Massachusetts, didn’t expect fancy treatment. They signed up for the experience of a lifetime, which included hard work, often uncomfortable accommodations, and encounters with some of nature’s most dangerous animals and environments.

Jamie, Arsen, and Tyler were among hundreds of high school kids nominated by their science teachers to take this trip. Earthwatch Institute sponsored (赞助) this adventure. Each year, Earthwatch employs thousands of volunteers worldwide to help with scientific research projects.

The group went all around the world to get a close look at the most pressing environmental issues of our time. Their assignments were as varied as their locations, and included measuring and attending pink flamingos in Kenya’s Great Rift Valley, and tracking giant sea turtles in Costa Rica.

As they worked with the Earthwatch scientists, Jamie, Arsen, and Tyler began to understand that we are at a critical moment in the life of our planet. Time for change is running out. As the teens went from country to country and witnessed different environmental dangers and challenges, they understood that solutions to important environmental issues start with the power of one person's actions. They realized that each of them can make a difference.

1. These teenagers went on the journey around the world _____.

A. to experience the most serous environmental problems on the earth

B. to bring the kindness of America to the other parts of the world

C. to go on sightseeing around the world

D. to call on more teenagers to join Earthwatch Institute

2. What’s true about their journey?

A. They had to pay for their journey on their own expense.

B. They often had to move from one hotel to another.

C. They had to take great pains to collect environmental information.

D. They received a warm welcome every time they arrived at a new place.

3. It can be inferred that Earthwatch Institute could be _____.

A. an international university that takes in students from all over the world

B. a TV station that makes programmes on the beautiful scenery of the earth

C. a travel agency that organizes adventure trips specially for school children

D. an organization that brings science to life for people concerned about earth’s environment

4. What did they these teenagers learn from the journey?

A. It was high time that people protected the environment.

B. Long journey was not suitable for school children.

C. It should take the whole world to help the children.

D. Environmental problems can be solved if school children take part.

题型:选择题

女,13岁,皮肤有多发结节和多发棕色素斑,MR表现如图,最可能的诊断是()

A.脸颜面血管瘤病

B.结节性硬化

C.神经纤维瘤病

D.听神经瘤

E.松果体瘤

题型:选择题

符合代偿性呼吸性酸中毒的血气分析为()

A.pH7.40,PaO250mmHg,PaCO240mmHg

B.pH7.30,PaO250mmHg,PaCO270mmHg

C.pH7.35,PaO280mmHg,PaCO220mmHg

D.pH7.25,PaO270mmHg,PaCO230mmHg

E.pH7.40,PaO2260mmHg,PaCO265mmHg

题型:选择题

团体保险费率低的原因不包括______。

A.采用团体投保的方法,规避了逆选择因素的消极影响,使平均死亡率、疾病率相对稳定
B.团体保险用一张总的保险单承保成百上千的人,简化了承保、收费、会计等手续
C.减少了代理人的佣金支出,节约了保险公司的业务管理费用
D.团体保险免体检,节约了体检费

题型:选择题

“二战”后,主要资本主义国家的经济发展经历了哪三个时期?指出每个时期经济发展的原因?

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