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国际资本流动的根本动力是扩大商品销售。()

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个人和家庭主要的投资来源是收入。()

根据资本资产定价模型，证券的期望收益率与该种证券的贝塔系数线性相关。()

Mandarin, or Putonghua, is the standard service sector language in our country. But recently, employees at a big city's subway station have been busy learning dialects of other parts of the country. Proponents say that using dialects in the subway is a way to provide better service. But opponents think that encouraging the use of dialects in public counters the national policy to promote Putonghua. What is your opinion？ Write an essay of about 400 words on the following topic:
Are Dialects Just as Acceptable in Public Places？
In the first part of your essay you should state clearly your main argument, and in the second part you should support your argument with appropriate details. In the last part you should bring what you have written to a natural conclusion or make a summary.
Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.

水平防潮层设在建筑物内外墙体沿地层结构部分的高度。如果建筑物底层室内采用实铺地面的做法，水平防潮层一般设在地面素混凝土结构层的厚度范围之内。工程中常将其设于-0.06m处。()