试题与答案

电力负荷控制系统终中,终端和多功能电能表之间,大多采用RS485接口进行串行通信。

题型:判断题

题目:

电力负荷控制系统终中,终端和多功能电能表之间,大多采用RS485接口进行串行通信。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1018/8a5ea4232517845c68c6f9a0741d44fb.html

下面是错误答案,用来干扰机器的。

参考答案:1.为防止因绝缘而遭到触电的危险,将与电气设备带电部分相绝缘的金属外壳或架构同接地体之间作良好的连接,称为保护接地。2.减少人身接触带电设备时的触电电流,防止电火花引燃爆炸气体。

试题推荐
题型:单项选择题

The road to controlling population growth in the 20th century was paved with good intentions and unpleasant policies that did not work, a new book argues an historian who grew up as the youngest of eight children might well be expected to approach the question of whether the world is overpopulated from an unusual angle. Matthew Connelly, a professor at Columbia University, dedicates his study of those who thought the planet had too many people and tried to do something about it to his parents, "for having so many children".

Yet, he assures the reader, it Was not his personal experience of large families that drew him to the subject. Mr. Connelly’s mentor, Paul Kennedy of Yale University, believed it was necessary to look beyond great-power rivalries to understand the post-cold-war era. In 1994 the pair wrote an article for Atlantic Mouthly arguing that population growth in poor countries, increasing awareness of global economic inequality and the prospect of mass migration could lead to clashes between the West and "the rest".

When, years later, Mr. Connelly began his own book on population growth, he still thought of the topic as a way to offer a broader understanding of world security. He ended up writing a very different-and angry-book, one about people who looked at the human race reproducing itself and saw what a gardener sees when looking at a prize plant: something to be encouraged to bloom in some places and pruned in others.

As the world population soared, the population controllers came to believe they were fighting a war, and there would be collateral damage. Millions of devices were exported to poor countries although they were known to cause infections and sterility. "Perhaps the individual patient is expendable in the general scheme of things," said a participant at a conference on the devices organized in 1962 by the Population Council, a research institute founded by John [D] Rockefeller, "particularly if the infection she acquires is sterilizing but not lethal. "

Furthermore, statistical estimates suggest that as much as 90% of the reason that women have families of a particular size is simply because that is the number of children they want. Where women gained education and rights, birth rates fell. As with reproduction itself, for people to become less fruitful, desire must precede performance.

Which one of the following is true according to Connelly’s book in 19947()

A.Population growth reflects the powers of great nations

B. Population growth became a problem for human being after the cold war

C. Population growth in underdeveloped countries may deepen economic inequality

D. Population growth lead to different controlling policies and these policies lead to clashes

查看答案
微信公众账号搜索答案