已知圆C：x2+y2-2x+4y-4=0，问是否存在斜率为1的直线l，使以l被圆

Wilson病的临床诊断标准包括（）

A.肝病史或肝病征

B.锥体外系症状

C.血清铜蓝蛋白显著降低或肝铜增高

D.角膜K-F环

E.阳性家族史

建设项目总投资中的（）投资，是总投资中最活跃、最敏感的部分，也是建设项目投资控制最核心最本质的部分。

A．原材料 

B．固定资产 

C．流动资产 

D．生产

《国家电网公司安全工作规定》第二十四条规定：安全生产委员会办公室设在（）

A、生产运维部门

B、总经理办公室

C、安全监督管理部门

D、后勤保障部门

Throughout the 19th century and into the 20th, citizens of the United States maintained a bias against big cities. Most lived on farms and in small towns and believed cities to be centres of (1) , crime, poverty and moral (2) Their distrust was caused, (3) , by a national ideology that (4) farming the greatest occupation and rural living (5) to urban living. This attitude (6) even as the number of urban dwellers increased and cities became an essential (7) of the national landscape. Gradually, economic reality overcame ideology. Thousands (8) the precarious (不稳定的) life on the farm for more secure and better paying jobs in the city. But when these people (9) from the countryside, they carried their fears and suspicions with them. These new urbanities, already convinced that cities were (10) with great problems, eagerly (11) the progressive reforms that promised to bring order out of the (12) of the city.

One of many reforms came (13) the area of public utilities. Water and sewerage systems were usually operated by (14) governments, but the gas and electric networks were privately owned. Reformers feared that the privately owned utility companies would (15) exorbitant (过渡的) rates for these essential services and (16) them only to people who could afford them. Some city and state governments responded by (17) the utility companies, but a number of cities began to supply these services themselves. (18) of these reforms argued that public ownership and regulation would (19) widespread access to these utilities and guarantee a (20) price.

（4）（）

A.proclaimed 

B.exclaimed 

C.claimed 

D.reclaim

某一类高层商住楼地上共32层、地下共3层，总建筑面积98502.60m²。地下1层至地上4层为商场，建筑面积为56236.25m²，地上4层以上为普通住宅，地下3层为汽车库。该商住楼内的防烟楼梯间及其前室、消防电梯间前室和合用前室靠外墙布置，具备自然排烟条件。商住楼建筑高度为103m，裙房商场建筑高度为27.80m。该商住楼设有室内、室外消火栓系统，自动喷水灭火系统，防烟和排烟系统，火灾自动报警系统，消防应急照明和消防疏散指示标志，灭火器等消防设施及器材。

根据以上场景，回答下列问题。

避难层的设置条件以及避难层的防火构造要求有哪些？