| The earth is witnessing an urban
revolution, as people worldwide crowd into towns and cities. In 1800 only
five percent of the world’s population were urban dwellers; now the proportion
has risen to more than forty-five percent, and by the year 2010 more people will
live in towns and cities than in the countryside. Humanity will, for the first
time, have become a predominantly urban species. Though the world is getting more crowded by the day, absolute numbers of population are less important than where people concentrate and whether these areas can cope with them. Even densities, however, tell us nothing about the quality of the infrastructure’-roads, housing and job creation, for example--or the availability of crucial services. The main question, then, is not how many people there are in a given area, but how well their A. the quality of the infrastructure and services B. where people are concentrated C. wealth and employment D. density figures and measurements [单选题]因为______,所以计算机中的所有信息都是以二进制方式表示的。
A.节约元件 B.所需的物理元件最简单 C.信息处理方便 D.运算速度快 [多选题]电缆终端过热，充油电缆终端套管温度分布不均，存在（）现象。
A.分层 B.漏油 C.鼓肚 D.绝缘焦化 [单选题]在防烟排烟系统中,排烟风机与加压送风机的不同在于（ ）。
A.排烟风机应保证在 220℃的环境条件下能连续工作不少于 20min B.排烟风机应保证在 220℃的环境条件下能连续工作不少于 30min C.排烟风机应保证在 280℃的环境条件下能连续工作不少于 20min D.排烟风机应保证在 280℃的环境条件下能连续工作不少于 30min [单项选择]女性，56岁，发热2天，T39℃，予消炎痛栓肛塞后体温可降至37℃，一周后出现乏力、恶心、呕吐，BUN25mmol／L，Cr560mmol／L，尿量300ml／24h，尿沉渣镜检可见许多RBC，异常RBC78%，嗜酸性粒细胞少量。鉴别急、慢性肾衰竭首要检查是（）
A. 血常规 B. 双肾B超 C. 血钾、钠、氯 D. 血气分析 E. 尿钾、钠、氯 [单选题][题号：497；鉴定点：BDA003；选择题；静态UPS由( )和静态电子开关等部件组成。
A.整流器，变压器 B.蓄电池组，稳压器 C.整流器，蓄电池组，逆变器 D.整流器，逆变器 [单选题]TYJL-Ⅱ型计算机联锁驱动单元的驱动信号端和驱动回线端测量驱动信号电压时，应为（ ）V的脉动电压。（ ）
A.2至2 B.2至3 C.3至4 D.4至7 [单项选择]资本主义法制原则是一种什么原则（）
A. 私有财产神圣不可侵犯 B. 法律面前人人平等 C. 依法治国 D. 三权分立 我来回答: 提交
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