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：2017-06-09 06:24 │ 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。

      A white woman took a plane to New York. When she got on the plane, she found a black man sitting
next to her seat. She was unsatisfied with this, so she    1   the stewardess(空中小姐).
     Soon the stewardess came. " Madam, what is the matter?" she asked.
     " Don't you see it?"  the woman said. " You placed me next to a    2   . I do not agree to sit next to
someone from such a disgusting group. Give me a different__3  ."
      " Be calm, please," the stewardess said. " Almost all the seats on this flight are taken.   4   will go to see
if another place is available. " The stewardess went away and then came back a few minutes   5   . "Madam, just as I thought, there are no    6     seats in the economy class(经济舱). I spoke to the captain and he told me that there is   7 no free seat in the business class(商务舱). But we have one seat in the first class (头等舱). "    8     the woman could say anything, the stewardess    9   . “It is not usual for our company to
allow someone from the economy class to sit in the first class. However, the captain feels that it would not
be good to make someone sit     10    someone so disgusting. " She turned to the black man, and said, "For
that reason, Sir, if you would like to, please take your bag because a seat is waiting for you in the first class. " At the moment, the other people on the plane stood up and hit their hands together and cheered.

( )1. A. asked
( )2. A. bad man
( )3. A. ticket
( )4. A. She
( )5. A. ago
( )6. A. free
( )7. A. already
( )8. A. When
( )9. A. went
( )10. A. behind

B. heard
B. white woman
B. seat
B. He
B. later
B. good
B. seldom
B. Till
B. left
B. ahead

C. called
C. white man
C. table
C. You
C. before
C. small
C. ever
C. While
C. continued
C. opposite to

D. told
D. black man
D. plane
D. I
D. after
D. single
D. also
D. Before
D. laughed
D. next to

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题型：选择题

小明同学为班会准备了以下方面的素材，其主题应是

A．朋友遍天下　

B．五十六个民族是一家

C．科教兴国

D．“一国两制”与祖国统一

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与面瘫主要相关的是（）

A.手太阳、足阳明经筋

B.手阳明、足太阳经筋

C.足少阳、足太阳经筋

D.手阳明、足厥阴经筋

E.手少阳、足太阳经筋

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重力坝失稳破坏型式是什么？岩基上的重力坝应该校核哪些断面的抗滑稳定性？

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患者，男性，20岁，有畏寒、有寒战、发热、头痛、四肢及腰背酸痛、乏力等，经查体咽部明显充血，扁桃体肿大，伴有颈部淋巴结肿大及压痛。血象提示白细胞与中性粒细胞增多和核左移现象。诊断为呼吸道感染。患者青霉素皮试阳性。不宜选用的药物是（）

A．四环素

B．红霉素

C．林可霉素

D．头孢霉素

E．庆大霉素

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