用N、H、O三种元素组成下列物质或微粒：（用符号填写）（1）一种气体单质___

发布时间：2017-05-17 23:08 │ 来源：www.tikuol.com

题型：问答题

问题：

用N、H、O三种元素组成下列物质或微粒：（用符号填写）

（1）一种气体单质______

（2）一种酸______

（3）相对分子质量最小的氧化物______

（4）一种带正电的根的离子______．

考点：化学式的写法和意义

题型：问答题

贵港的“乳泉酒”畅销全国各地，打开酒瓶盖就能闻到浓浓的酒香味，这是因为

A．分子在不断运动

B．分子质量很小

C．分子间有间隙

D．分子可以再分

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女性，54岁。缓起发热，咳嗽，痰呈脓性，伴腥臭味，每日约150ml。病程已10d，多种抗生素治疗不见改善。X线示右下肺叶后基底段团块状影，伴空洞和液平。两周前曾有拔牙史。

本例诊断以下列哪种疾病最为可能（）。

A.空洞性肺结核

B.阻塞性肺脓肿

C.支气管肺囊肿继发感染

D.吸入性肺脓肿

E.肺隔离症

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题型：问答题

完形填空。

     There are many different ways of seeing a town for the first time. One of them is to walk around it, guide-
book   1   hand. Of course, we may   2   with our guide-books the history and   3   developments of a town
and get to know them.   4   then, if we take out time and   5   in a town for a while, we may get to know it
better. When we   6   it as a whole, we begin to have some   7 , which even the best guide-books do not
answer. Why is the town just   8   this, this shape, this plan, this size? Why do its streets   9   in this particular
way, and not in any  10  why?
     Here even the best guide-book  11  us. One can't find in it the information about how a town has developed
to the  12  appearance. It may not describe the original (最初的)  13  of a town. However, one may get some
idea of what I  14  look like by walking around the town. One can also imagine  15  the town was first planned
and . Then one can learn more about in what direction the town  16  to develop.
     What is the  17  of studying towns in the way? For me, it is  18  that one gets a greater depth of pleasure
by visiting and seeing a town with one's own eyes. A  19  visit to a town may help one better understand why
it is attractive  20  just reading about it in a guide-book.

( )1. A. in
( )2. A. write
( )3. A. strange
( )4. A. But
( )5. A. look at
( )6. A. look at
( )7. A. ideas
( )8. A. of
( )9. A. open
( )10. A. one
( )11. A. helps
( )12. A. old
( )13. A. capital
( )14. A. used to
( )15. A. what
( )16. A. stops
( )17. A. point
( )18. A. nearly
( )19. A. costly
( )20. A. from

B. at
B. study
B. similar
B. Before
B. work
B. look after
B. opinions
B. for
B. run
B. more
B. tricks
B. normal
B. meaning
B. seemed to
B. how
B. appears
B. view
B. simply
B. formal
B. than

C. by
C. tell
C. separate
C. Since
C. stay
C. look for
C. feelings
C. like
C. begin
C. other
C. fails
C. first
C. design
C. had to
C. when
C. starts
C. problem
C. generally
C. group
C. through

D. on
D. remember
D. special
D. Until
D. wait
D. look up
D. questions
D. as
D. move
D. such
D. satisfies
D. present
D. change
D. happened to
D. where
D. continues
D. difficulty
D. hardly
D. personal
D. with

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因建设引起建筑物、构筑物与供电设施相互妨碍，需要迁移供电设施或采取防护措施时，应按（）的原则，确定其担负的负责。

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大修时应重点检查哪些级的动叶片？

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用N、H、O三种元素组成下列物质或微粒：（用符号填写） （1）一种气体单质___

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用N、H、O三种元素组成下列物质或微粒：（用符号填写）（1）一种气体单质___