不定项选择关于曲线运动速度的方向，下列说法中正确的是（） A．在曲线运动中速

发布时间：2017-06-09 01:56 │ 来源：www.tikuol.com

题型：不定项选择

问题：

不定项选择

关于曲线运动速度的方向，下列说法中正确的是（）

A．在曲线运动中速度的方向总是沿着曲线并保持不变

B．质点做曲线运动时，速度方向是时刻改变的，它在某一点的瞬时速度的方向与这一点运动的轨迹垂直

C．曲线运动中速度的方向是时刻改变的，质点在某一点的瞬时速度的方向就是在曲线上的这一点的切线方向

D．曲线运动中速度方向是不断改变的，但速度的大小保持不变

考点：认识曲线运动

题型：不定项选择

完形填空：

     A little boy invites his mother to his school's first teacher-parent meeting. To the little boy's disappointment,
she said she would 1 . This would be the first time that his classmates and teacher 2 his mother and he felt
ashamed (羞愧) of what she looked like. 3 she was a beautiful woman, there was a deep scar (伤痕)
that covered the whole right side of her face. The boy never wanted to 4 why or how she got the scar.
    At the meeting, everyone was impressed by the kindness and natural beauty of his mother in spite of the scar,
but the little boy still felt uncomfortable and   5 himself from everyone's view (视野). However, he could hear
the 6 between his mother and his teacher. The teacher asked 7 , "How did you get the scar on your face?"
The mother replied, " 8 my son was a baby, he was in a room that caught fire. Everyone was   9 afraid to go
in because the fire was terrible, so I went in. As I was running toward his bed, I saw a long 10 of wood
coming down and I placed myself over him trying to 11 him from hurt. I was knocked down, but luckily, a
fireman came in and saved 12 of us." She said slowly, "This scar will be 13 , but until now, I have never
felt sorry for what I did."
     At this point, the little boy came out running towards his mother with tears in his eyes. This was his first time
to hear the story. He   14 her in arms and felt the great 15 from his mother.

( ) 1. A. listen
(    ) 2. A. met
(    ) 3. A. Because
(    ) 4. A. tell about
(    ) 5. A. enjoyed
(   ) 6. A. voice
(    ) 7. A. carefully
(    ) 8. A. As
(    ) 9. A. so
(    ) 10. A. bit
(   ) 11. A. keep
(    ) 12. A. both
(    ) 13. A. leaving
(    ) 14. A. pushed
( ) 15. A. thank

B. talk
B. looked at
B. Though
B. think about
B. helped
B. talk
B. happily
B. When
B. much
B. pair
B. make
B. either
B. changing
B. held
B. pride

C. go
C. watched
C. So
C. worry about
C. hid
C. speech
C. loudly
C. Since
C. quite
C. piece
C. help
C. all
C. missing
C. put
C. sadness

D. work
D. found
D. But
D. know about
D. taught
D. conversation
D. angrily
D. Until
D. too
D. kind
D. save
D. several
D. lasting
D. closed
D. love

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题型：不定项选择

光变应性接触性皮炎的主要作用光谱是（）

A.UVA

B.UVB

C.UVC

D.UVA和UVB

E.UVA和UVC

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题型：不定项选择

社会主义的本质就是解放生产力、发展生产力，消灭剥削，消除两极分化，最终达到 * * 主义。

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题型：不定项选择

企业非银行信息接口规范中，若某数据项的状态为“M”，则表示（）。

A.必须填写该数据项

B.不填写该数据项

C.可以不填写该数据项

D.不确定是否填写该数据项

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题型：不定项选择

相对而言，属于阴的基本物质有( )

A．气

B．血

C．津

D．液

E．精

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