设计变更是()的依据之一。A．仲裁 B．延期 C．索赔 D．定立合同

发布时间：2017-06-14 05:41 │ 来源：www.tikuol.com

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问题：

设计变更是()的依据之一。

A．仲裁

B．延期

C．索赔

D．定立合同

考点：一级建造师市政公用工程专业工程管理与实务(市政公用工程)3

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在金融工具的性质中，成反比关系的是()。

A.期限性与收益性

B.风险性与期限性

C.期限性与流动性

D.风险性与收益性

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如图所示，相互垂直的匀强电场和匀强磁场，其电场强度和磁感应强度分别为E和B，一个质量为m，带正电荷量为q的油滴，以水平速度v₀从a点射入，经一段时间后运动到b.试计算：

(1)油滴刚进入叠加场a点时的加速度．

(2)若到达b点时，偏离入射方向的距离为d，此时速度大小为多大？

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Cloze
     Ancient Greek philosopher Aristotle viewed laughter as "a bodily exercise precious to health."
Laughter does _1_ short-term changes in cardiovascular(心血管的) function and respiration, boosting
heart rate, respiratory rate and depth, as well as oxygen consumption. But because hard laughter is
difficult to last, a good guffaw(loud laugh)is unlikely to have _2 cardiovascular benefits the way walking
or jogging does.
     _3_, instead of building up muscles, as exercise does, laughter apparently accomplishes the _4_.
Studies _5_ back to the 1930s indicate that laughter _6_ muscles, decreasing muscle tone(肌肉紧张度)
for up to 45 minutes after the guffaw subsides.
     Such physical relaxation might help _7_ psychological stress. After all, the act of laughing probably
does produce other types of physical feedback that _8_ an individual's emotional state. _9_ one classical
theory , our feelings are partially rooted in physical reactions. American psychologist William James and
Danish physiologist Carl Lange argued at the end of the 19th century that humans do not cry _10 they
are sad but that they become sad when the tears begin to flow.
     Although sadness also goes before tears, evidence suggests that emotions can flow from muscular
responses. In an experiment published in 1988, social psychologist Fritz Strack of the University of W?
rzburg in Germany and his colleagues asked volunteers to _11_ a pen either with their teeth-thereby
creating an artificial smile-or with their lips, which would produce a _12_ expression. Those forced to
exercise their smiling muscles _13_ more energetically to funny cartoons than those whose mouths were
contracted in a frown(皱眉)did, suggesting that expressions may influence _14_ rather than just the other
way around. _15_, the physical act of laughter could improve mood.

( )1. A. reflect
( )2. A. measurable
( )3. A. In turn
( )4. A. opposite
( )5. A. dating
( )6. A. hardens
( )7. A. cause
( )8. A. improve
( )9. A. Except for
( )10. A. unless
( )11. A. fetch
( )12. A. disappointed
( )13. A. adapted
( )14. A. emotions
( )15. A. Eventually

B. demand
B. manageable
B. In fact
B. impossible
B. dated
B. weakens
B. generate
B. decrease
B. According to
B. until
B. bite
B. excited
B. adjust
B. motions
B. Consequently

C. indicate
C. affordable
C. In addition
C. average
C. to date
C. tightens
C. relieve
C. relax
C. Due to
C. if
C. pick
C. joyful
C. turned
C. movement
C. Similarly

D. produce
D. renewable
D. In brief
D. expected
D. date
D. relaxes
D. produce
D. increase
D. As for
D. because
D. hold
D. indifferent
D. reacted
D. motive
D. Comparatively

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简述生物战剂的特点。

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为何说合理的社会流动是现代社会生存和发展所必须的？

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