问题 多项选择题 案例分析题

低压断路器可用于保护变压器、配电线路、电动机等,一般低压断路器的选择包括额定电压、壳架等级、额定电流(指最大的脱扣器额定电流)的选择。请对于不同的使用要求,回答以下问题:

塑壳式断路器的主要特征是所有部件都安装在一个塑料外壳中,没有裸露的带电部分,提高了使用的安全性。塑壳式断路器多为非选择型,一般用于(),也可用于各种生产机械的电源开关。

A.配电馈线控制和保护

B.小型配电变压器的低压侧出线总开关

C.动力配电终端控制和保护

D.住宅配电终端控制和保护

答案

参考答案:A, B, C, D

单项选择题 B型题
单项选择题

"The impulse to excess among young Britons remains as powerful as ever, but the force that used to keep the impulse in check has all but disappeared," claimed a newspaper. Legislation that made it easier to get hold of a drink was "an Act for the increase of drunkenness and immorality", asserted a politician.

The first statement comes from 2005, the second from 1830. On both occasions, the object of scorn was a parliamentary bill that promised to sweep away " antiquated" licensing laws. As liberal regulations came into force this week, Britons on both sides of the debate unwittingly followed a 19th-century script.

Reformers then, as now, took a benign view of human nature. Make booze cheaper and more readily available, said the liberalisers, and drinkers would develop sensible, continental European-style ways. Nonsense, retorted the critics. Habits are hard to change; if Britons can drink easily, they will drink more.

Worryingly for modern advocates of liberalisation, earlier doomsayers turned out to be right. Between 1820 and 1840, consumption of malt (which is used to make beer) increased by more than 50%. Worse, Britons developed a keener taste for what Thomas Carlyle called "liquid madness"—gin and other spirits.

The backlash was fierce. Critics pointed to widespread debauchery in the more disreputable sections of the working class. They were particularly worried about the people who, in a later age, came to be known as "ladettes". An acute fear, says Virginia Berridge, who studies temperance at the London School of Hygiene and Tropical Medicine, was that women would pass on their sinful ways to their children.

In the 19th century, temperance organisations set up their own newspapers to educate the public about the consequences of excess. That, at least, has changed: these days, the mainstream media rail against the demon drink all by themselves.

According to the text, the author’s attitude toward licensing laws is()

A. biased

B. negative

C. indifferent

D. affirmative