如图所示,电源电压为6V,R1=R2=30Ω,求: (1)当开关S断开时,电路中

题型:计算题

问题:

如图所示,电源电压为6V,R1=R2=30Ω,求:

(1)当开关S断开时,电路中的总电阻、和R2两端的电压;

(2)当开关S闭合时,电流表示数和R2两端的电压.

考点:欧姆定律及其应用
题型:计算题

阅读理解。

     What will the future be like?  It's possible that we may often  fly up into  space! Out  of all the coolest

inventions of the year, Times chose Spaceship One as the best.

     Spaceship One is a 6-meter-long white spaceship. On June 21st, American pilot Mike Melvill flew it

to space and  back-about 100 kilometers  up  into  the sky.  ①Some might say it's not a big deal.  You

know, people went to the moon years ago.

     Well, Spaceship One  is  special  because it is the first spaceship that wasn't made by the government.

A private(私人的) US company built and launched it. Lots of people want to travel in space. But it's too

expensive. American millionaire(大富豪) Dennis Tito  paid almost US $ 20  million  to  become the first

space tourist to visit the International Station in 2001. So private companies began to  think  of  making

their own spaceship to take other tourists up into space. The success of Spaceship One is a good start.

In the next 10 to 15 years, ②if you pay $20,000 to $100,000 you could fly high above the earth.

     ③What about having your own spaceship in your garage(车库)  and  taking  it  to  space  at  the

weekend?

1.将①处画线部分的句子翻译成汉语:

____________________________________________________________________________

2.将②处画线部分的句子改为同义句:

____________________________________________________________________________

3.将③处画线部分的句子改为同义句:

____________________________________________________________________________

4.Imagine(想象) what the future will be like.

____________________________________________________________________________

5.Do you want to have your own spaceship in your garage? Why?

____________________________________________________________________________

题型:计算题

患儿,男,3岁,1周前曾患感冒,今晨发现全身散发瘀点,下肢尤多见,有4处瘀斑,查体:T37℃,肝脾不大,实验室检查:血小板40×109/L,其他未见异常。

该患儿最可能的诊断是()。

A.过敏性紫癜

B.血友病甲

C.白血病

D.维生素缺乏症

E.特发性血小板减少性紫癜

题型:计算题

男,60岁,心力衰竭患者哪种情况下不宜用血管扩张药治疗

A.心力衰竭伴低血压或血容量不足

B.心力衰竭伴高血压

C.心力衰竭伴心房颤动

D.心力衰竭伴低血钾

E.心力衰竭伴三度房室传导阻滞

题型:计算题

以下属于"医患关系的技术性方面"的是()

A.往中的社会方面的关系

B.医患交往中的治疗方面的关系

C.医患交往中的伦理方面的关系

D.医患交往中的心理方面的关系

E.医患交往中的人文关怀

题型:计算题

活塞环按功用不同可分为哪两种?作用是什么?

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