搜题请搜索小程序“爱下问搜题”
问题 单项选择题

某座建筑物由一台1000kVA变压器采用TN-C-S系统供电，线路材质、长度和截面如图所示。图中小间有移动式设备由末端配电箱供电，回路首端装有单相I=20A断路器。建筑物作有总电位联结，已知截面为50mm2、6mm2、2.5mm2铜电缆每芯导体在短路时每km的热态电阻值为0.4Ω、3Ω、8Ω。请回答下列问题，并列出解答过程：

如果在小间内移动式设备有带电裸露导体，作为防直接电击保护的措施，下列哪种处理方式最好？（）

A.采用额定电压为50V的特低电压电源供电

B.设置遮栏和外护物以防止人体与裸露导体接触

C.裸露导体包以绝缘，小间地板绝缘

D.该回路上装有动作电流不大于30mA的剩余电流动作保护器

答案

参考答案：C

综合题

（20分）民主是人类社会发展到一定阶段的产物，民主政治是人类政治文明的共同成果，追求自由、平等、公正是全人类的政治发展趋势，是近代以来世界各国的政治主流。阅读下列材料，回答问题。

材料一

(1)结合所学知识，从生产方式角度简析形成图一、图二两种不同政治体制的原因。(4分)两种政体为近现代社会政治文明建设留下了哪些有益的借鉴？(4分)

材料二　从古典民主没落到现代民主萌生，中间长达千余年，17、18世纪资产阶级代议制在欧美国家先后建立。但由于国情差异，各国的社会政治制度呈现多元化特点。

(2)若对材料二中造成西方各国政治模式不同的原因进行分析，应从哪些角度思考？(6分)

材料三　在华盛顿的主持下，制宪会议一共开了116天……面对代表们的唇枪舌剑，制宪会议 * * 华盛顿却几乎一言不发……华盛顿的沉默和坚持成为一种无形的力量。1787年9月17日，美国第一部成文宪法最终形成。……联邦宪法的制定和实施，使一个真正意义上的美国诞生了。

——《大国崛起》解说词

(3)根据材料三并结合所学知识，指出美国1787年宪法规定的宪政体制的突出特点。(2分)美国找到了一条怎样的最适合自己的政治发展道路？(4分)
查看答案
完形填空

CPR is cardiopulmonary resuscitation (心肺复苏). It forces air into the lungs and pumps(用泵抽) blood and oxygen to the brain in order to increase the chances that a person whose heart stops will survive. It increases the chances that he or she will suffer little or no brain damage.

The American Heart Association suggests two ways to perform CPR. One combines the use of hands to pump the victim’s chest with rescue breathing. The other method is called “Hands-Only CPR”, which is for people who are unwilling or unable to perform rescue breathing. Some people fear infection(感染). Others say they are afraid of making the patient worse.

But the American Heart Association strongly asks people in contact with a victim(受害者) to take action and tells how to take it. It says you can recognize a person needing CPR. He or she is unconscious(无意识) -- unable to communicate or react to surroundings or speech. His or her skin has lost color. The person is not breathing. If such conditions describe the situation, chances are the heart has stopped beating.

You should act by calling for help, or sending someone else. Even if you cannot do mouth-to-mouth rescue breathing, you can perform Hands-Only CPR. You can do chest compressions(压迫) that help to keep blood flowing to the brain and the heart. To perform the compressions, place one hand over the other and press firmly on the center of the victim’s chest. Push down about five centimeters. Aim for one hundred compressions each minute.

Doctor Sayre suggests that medical workers do both the breathing method and chest compressions as usual. He says some victims, including babies, need the mouth-to-mouth breathing with the compressions. Still, the doctor says it is better to do just chest compressions than to do nothing.

 
查看答案