题目内容 (请给出正确答案)
提问人:网友l******8 发布时间:2023年2月25日 16:01
[单项选择题]

卧式的热介质锅炉安装了二层螺旋受热盘管,内层盘管侧()

A、扩散换热

B、直接承受辐射热

C、对流换热

D、都不对

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Regulation and Control. The government regulates and controls private enterprise in many ways, for the purpose of assuring that business serves the best interests of the people as a whole. Regulation is necessary in areas where private enterprise is granted a monopoly, such as in telephone or electric service, or in other areas where there is limited competition, as with railroads or airlines. Public policy permits such companies to make a reasonable profit, but limits their ability to raise prices unfairly (as defined by the regulators), since the public depends on their services. Often control is exercised to protect the public, as for example, when the Food and Drug Administration bans harmful drugs, or requires standards of quality in food. In other industries, government sets guidelines to ensure fair competition without using direct control.
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Direct Assistance. The government provides many kinds of help to businesses and individuals. For example, tariffs permit certain products to remain relatively free of foreign competition; imports are sometimes taxed so that American products are able to compete better with certain foreign goods. Government also provides aid to farmers by subsidizing prices they receive for their crops. In quite a different area, government supports individuals who cannot adequately care for themselves, by making grants to working parents with dependent children, by providing medical care for the aged and the indigent, and through social insurance programs to help the unemployed and retirees. Government also supplies relief for the poor and help for the disabled.
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