局域网拓扑结构在办公自动化中常用的有( ) A．总线型 B．环形 C．星型 D．塔

某医院病房区采用理想的温湿度独立控制空调系统，夏季室内设计参数t_n=27℃，φ_n=60%。室外设计参数：干球温度36℃、湿球温度28.9℃[标准大气压、空气定压比热容为1.01kJ/（kg·K），空气密度为1.2kg/m³。已知：室内总散湿量为29.16kg/h，设计总送风量为30000m³/h，新风量为4500m³/h，新风处理后含湿量为8.0g/kg_干空气，问：系统的室内干式风机盘管承担的冷负荷应为下列何项（盘管处理后空气相对湿度为90%）查h-d图计算，并绘制空气处理的全过程（新风空调机组的出风的相对湿度为70%）。（）

A．39～49kW

B．50～60kW

C．61～71kW

D．72～82kW

某患者，男，60岁，与老同学聚餐时突然出现右侧肢体无力，随即摔倒，头痛剧烈，伴有呕吐，神志清醒，无言语不清，高血压13年。

头颅CT检查见"左侧基底节区可见2.1cm×4.8cm×4cm圆形高密度影，边界清楚"，该患者最可能的诊断是（）

A.硬膜下血肿

B.出血性梗死

C.高血压脑出血

D.蛛网膜下腔出血

E.自发性颅内出血

Almost every day the media discovers an African American community fighting some form of environmental threat from land fills, garbage dumps, petrochemical plants, refineries, bus depots, and the list goes on. For years, residents watched helplessly as their communities became dumping grounds.

But citizens didn’t remain silent for long. Local activists have been organizing under the mantle of environmental justice since as far back as 1968. More than three decades ago, the concept of environmental justice had not registered on the radar screens of many environmental or civil rights groups. But environmental justice fits squarely under the civil rights umbrella. It should not be forgotten that Dr. Martin Luther King, Jr. went to Memphis on an environmental and economic justice mission in 1968, seeking support for striking garbage workers who were underpaid and whose basic duties exposed them to environmentally hazardous conditions.

In 1979, a landmark environmental discrimination lawsuit filed in Houston, followed by similar litigation efforts in the 1980s, rallied activists to stand up to corporations and demand government intervention.

In 1991, a new breed of environmental activists gathered in Washington, D.C., to bring national attention to pollution problems threatening low-income and minority communities. Leaders introduced the concept of environmental justice, protesting that Black, poor and working-class communities often received less environmental protection than White or more affluent communities. The first National People of Color Environmental Leadership Summit effectively broadened what "the environment" was understood to mean. It expanded the definition to include where we live, work, play, worship and go to school, as well as the physical and natural world. In the process, the environmental justice movement changed the way environmentalism is practiced in the United States and, ultimately, worldwide.

Because many issues identified at the inaugural summit remain unaddressed, the second National People of Color Environmental Leadership Summit was convened in Washington, D. C., this past October. The second summit was planned for 500 delegates; but more than 1,400 people attended the four-day gathering.

"We are pleased that the Summit II was able to attract a record number of grassroots activists, academicians, students, researchers, planners, policy analysts and government officials. We proved to the world that our movement is alive and well, and growing. "says Beverly Wright, chair of the summit. The meeting produced two dozen policy papers that show powerful environmental and health disparities between people of color and Whites.

In 1968, Martin Luther King, Jr. went to Memphis to help the garbage workers ().

A. get relieved of some of their basic duties

B. know what environmental justice was

C. fight for better working conditions

D. recognize their dangerous surroundings

对于事先已确定发行条款的国债，我国仍采取承购包销方式，目前主要运用于不可上市流通的凭证式国债的发行。( )

累积的优先股