According to the United States government,

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问题:

According to the United States government, people are classified as homeless if they have no place to stay and no expectation of finding a place for the next thirty days, Although technically accurate, that is an impersonal assessment of an enormous and very human problem,
The homeless population represents all of us Americans, It includes men and women, the elderly, children, and infants. Its members are from all ethnic (种族的) groups. What they have in common is poverty.
Currently in the U.S., thirty-nine million people live in poverty. When money is really tight, paying the rent or buying food often becomes a choice. Government assistance in the form of food stamps does help but, as one homeless man explains, you can’t pay the rent with food stamps.
With no money for rent, the streets and homeless shelters become the alternative.

The U.S. government helps the homeless by ______.
A. giving them homeless allowancesB. giving them food stamps
C. finding jobs for them D. finding residences for them

Although men constitute the largest group within the homeless population, homeless women with children are rapidly joining them. In fact, one quarter of the homeless people in the U.S. are teenagers and young children.
People may become homeless for numerous reasons. However there are certain factors that many of these individuals have in common. They include a lack of adequate education and job skills. A majority of the teenagers and adults have not completed high school.
The abuse of alcohol and drugs is also a common factor. One third of the adult homeless population abuses alcohol, while one quarter of the same group uses drugs.
Some members of this population suffer mental health problems. Within the past several years many institutions for the menially ill have been closed and their patients sent "home". Unfortunately, a number of those people have no home to go to and they are unable to adequately look after themselves.
Job loss in today’s economy has also become a real factor in the loss of people’s homes. The breakup of families through abandonment and divorce are also contributing factors, particularly when there are children involved. The parent who is left to care for the kids with inadequate income may be forced to depend on the homeless shelters to put a roof over their heads.

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水位是以水位基准面为零值,高于该基准面以上的水位值为负值。

题型:单项选择题

在研究性学习中,某同学设计了一个测量导电纸的导电膜厚度的实验,该同学从资料上查得导电纸导电膜导电材料的电阻率为ρ,并利用下列器材完成了这个实验:

A.电源E(电动势为12V,内阻不计)

B.木板N(板上放有导电纸一张,导电膜向上),两个金属条A.B(平行放置在导电纸上,与导电纸接触良好,用作电极)

C.滑线变阻器R(其总阻值小于两平行电极间导电纸的电阻)

D.毫米刻度尺.

E.电压表V(量程为6V,内阻约3kΩ)

F.电流表A(量程为0.6A,内阻忽略不计)

G.开关K,导线若干。

(1)请在图示实物图中完成实物连线。

(2)实验中应测定的物理量是:                            

(3)计算导电膜厚度h的公式是:                   。(用ρ和测得物理量的符号表示)

题型:单项选择题

如图所示的电路中,闭合电键,灯L1、L2正常发光,由于电路出现故障,突然发现灯L1变亮,灯L2变暗,电流表的读数变小,根据分析,发生的故障可能是

A.R1断路

B.R2断路

C.R3短路

D.R4短路

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某工程公司中标承包一城市道路施工项目,该工程项目所需的主要建材有路基土方填料、砂石材料、水泥、沥青材料、沥青混合料和钢材等。所有材料均由项目部自己采购和组织运输。项目部材料采购部门拟按工程量清单→材料需用量计划→材料供应计划→材料采购计划→材料使用计划的顺序进行材料计划管理,对几种材料的主要工程指标及工程特性提出了如下要求(摘要):
(1)对于碎石,提出了强度和耐磨性要求。
(2)为区分砂的粗细度,提出了砂的细度模数和平均粒径。
(3)对于水泥,提出了化学性质、物理性质要求。

石灰工业废渣稳定土宜在春末和夏季组织施工,施工期的日最低气温应在( )℃以上。

A.0

B.2

C.5

D.7

题型:单项选择题

贫血按发病机制分类()

A.红细胞生成减少即造血不良性贫血

B.红细胞过度破坏即溶血性贫血

C.失血性贫血

D.小细胞低色素性贫血

E.大细胞性贫血

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