Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (52) an educational institution, and they are required to study for a (53) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (54) resources to support themselves (55) in this country.
In order to work here the foreigner needs a work permit, (56) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (57) these permits, and there is little that can be done (58) it; it would be extremely unwise for a foreign visitor to work (59) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (60) residence permits of up to fi
A. minimum
B. maximum
C. minority
D. majority
某市商业区原有一条长度达300m的步行街；步行街两侧建筑均为地上2层，每层层高均为4m，建筑高度均为8.1m（建筑室外设计地面标高-0.1m，建筑首层室内地面标高±0.0m），每侧建筑每层建筑面积均为6000m2，耐火等级均为二级（其均按最低耐火极限选用各建筑构件），建筑外墙均为实体墙，使用功能均为餐饮、商店等商业设施，每间商铺的建筑面积均在400～500m2之间，每层均设有面向步行街的外窗，首层的安全出口均直通步行街，二层均设有出挑宽度为1m的回廊（为开敞式）；步行街两侧建筑之间的防火间距均为6m。为提升商业服务水平，拟对步行街及其两侧建筑进行改造。改造方案如下：一是将步行街地下挖空，建造1个地下2层、每层层高均为4m的地下建筑（耐火等级一级，其均按最低耐火极限选用各建筑构件）；该建筑地下一层建筑面积为10000m2，使用功能为展览厅（含1间消防控制室）；地下二层建筑面积为30000m2，使用功能为商店营业厅，该营业厅由10000m2的服装区、5000m2的家电区、5000m2的建材区、5000m2的家具区和5000m2的灯具区组成；二是利用步行街两侧建筑屋顶，在步行街顶部利用耐火极限0.50h的钢结构（喷涂防火涂料）搭设采光安全玻璃顶棚，顶棚上开设有效面积为步行街地面面积20％的自然排烟口：三是将步行街两侧建筑的二层均通过原有回廊和新增的敞开式连廊连通，步行街上部楼板的开口面积为步行街地面面积的30％。
问题：
1.改造方案实施后，步行街及其两侧建筑、地下建筑内应分布设置哪些消防设施？
2.请确定地下建筑每层所需的安全出口总净宽度，并写出计算过程。
3.针对地上步行街，请指出改造方案实施后与现行有关国家工程建设消防技术标准不符之处；并在经济合理的前提下，提出整改措施。
4.针对地下改造的商业营业厅，指出与现行有关国家工程建设消防技术标准不符之处；并提出整改措施。
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