本章主要介绍化工中常用的流体输送机械的基本结构、工作原理和特性,以便能够依据流体流动的有关原理正确地选择和使用流体输送机械。具体地说，就是根据输送任务正确地选择输送机械的类型和规格，决定输送机械在管路中的位置,计算所消耗的功率等，使输送机械能在高效率下可靠地运行。
CE2 液体输送机械
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Shopping & Communication 网购与网聊
In modern society, it is possible to go shopping, work and communicate via the Internet without face-to-face contact with one another. To what extent do you think this is a positive or negative development?
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Privacy Concerns 网络隐私问题
Today, many people put their personal and private information online (address, phone number, and credit card number) to facilitate everyday activities, such as banking, shopping, and socializing. Is this a positive or negative development?
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Forms of News Dissemination 新闻传播形式
More and more people no longer read newspaper or watch TV programs to get news. They get news about the world through the internet. Is this a positive or negative development?
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命运荒诞 生命虚无 众生皆苦——解构《白日焰火》
黑与白是社会的两极，也可以说是善恶的两极，而无处不在又无可逃离的灰，才是社会或者说生命的真相。这也直指电影最核心主题——命运的荒诞，生命的虚无，众生皆苦。
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Long Life Expectancy Impacts 人口老龄化
A recent survey shows that in many countries across the world people are generally living longer. But an increased life expectancy has many implications for the aging individuals and for the society as a whole. What are the possible effects of a longer life expectancy on individuals and the society?
