如图所示为一磁流体发电机示意图，A、B是平行正对的金属板，等离子体（电离的气体，

发布时间：2017-07-08 17:30 │ 来源：www.tikuol.com

题型：选择题

问题：

如图所示为一磁流体发电机示意图，A、B是平行正对的金属板，等离子体（电离的气体，由自由电子和阳离子构成，整体呈电中性）从左侧进入，在t时间内有n个自由电子落在B板上，则关于R中的电流大小及方向判断正确的是（　　）

A．I= ，从上向下

B．I= ，从上向下

C．I= ，从下向上

D．I= ，从下向上

考点：电流路端电压

题型：选择题

完形填空。

     Have you ever had to decide whether to go shopping or stay home and watch TV on a weekend? Now
you   1 do both at the same time. Home shopping television networks (网络) have become a   2 for many
people to shop without   3 having to leave their homes.
     Some shoppers are   4 of department stores and supermarkets-  5 the crowds, waiting in long lines,
and sometimes   6 of finding anything they want to buy. They'd rather sit quietly at home in front of the
TV set and   7 a friendly announcer describe a product   8 a model shows it. And they can   9 around
the clock, buying something  10 by making a phone call.
     Department stores and even mail-under companies are  11  to join in the success of home shopping. Large
department stores are busy  12 their own TV channels (频道) to encourage TV shopping in the future.  13
can ask questions about products and place  14 , all through their TV sets.
     Will shopping by television  15 take the place of shopping in stores? Some industry managers think so.
  16 many people find shopping at a  17 store a great enjoyment. And for many shoppers, it is still important
to  18 or try on dresses they want to buy. That's  19 specialists say that in the future, home shopping will  20
together with store shopping but will never entirely replace (取代) it.

( )1. A. must
( )2. A. programme
( )3. A. ever
( )4. A. proud
( )5. A. fighting
( )6. A. sense
( )7. A. see
( )8. A. until
( )9. A. shop
( )10. A. suitably
( )11. A. nervous
( )12. A. putting up
( )13. A. Guests
( )14. A. orders
( )15. A. lastly
( )16. A. Then
( )17. A. general
( )18. A. design
( )19. A. how
( )20. A. exist

B. should
B. way
B. never
B. fond
B. striking
B. doubt
B. watch
B. since
B. wait
B. cheaply
B. lucky
B. making up
B. Assistants
B. goods
B. finally
B. Yet
B. popular
B. make
B. why
B. practise

C. shall
C. reason
C. still
C. tired
C. treating
C. hope
C. let
C. if
C. turn
C. simply
C. equal
C. setting up
C. Managers
C. books
C. especially
C. However
C. real
C. wear
C. what
D. follow

D. can
D. purpose
D. once
D. careful
D. stopping
D. feeling
D. notice
D. while
D. deliver
D. hardly
D. eager
D. looking up
D. Customers
D. answers
D. fortunately
D. Therefore
D. true
D. touch
D. when
D. appear

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病历摘要：患者男性，38岁，右眼前有黑影漂动十天伴下方视物不清七天，不伴有红肿及眼痛症状，否认有眼外伤史，但有高度近视史约十年，家族中无类似病史。

依据病史你初步认为应是哪种疾病可能？（）

A.高度近视眼

B.玻璃体混浊

C.视网膜脱离

D.视网膜中央动脉阻塞

E.视神经炎

F.急性青光眼

G.白内障形成

H.虹膜炎

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暂空床的评估

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透脓法常用的方剂是（）。

A.托里消毒散

B.神功内托散

C.透脓散

D.阳和汤

E.青蒿鳖甲汤

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二氧化碳激光器的电光转换效率与固体激光器相比（）。

A.低

B.没有差别

C.高

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