| As the twentieth century began, the
importance of formal education in the United States increased. The frontier had
mostly disappeared and by 1910 most Americans lived in towns and cities.
Industrialization and the bureaucratization of economic life combined with a new
emphasis upon credentials and expertise to make schooling increasingly important
for economic and social mobility. Increasingly, too, schools were viewed as the
most important means of integrating immigrants into American society. The arrival of a great wave of southern and eastern European immigrants at the turn of the century coincided with and contributed to an enormous expansion of formal schooling. By 1920 schooling to age fourteen or beyond was compulsory in most states, and the school year was greatly lengthened. Kindergartens, vacation schools, extracurric A. alternatives to formal education provided by public schools B. the importance of education changes C. activities that competed to attract new immigrants to their programs D. the increased impact of public schools on students [判断题]火灾等级标准划分为一般火灾、较大火灾 、重大火灾、特别重大火灾。( )
A.正确 B.错误 [多选题]公共定价是指政府对公用企业生产的商品和服务的定价或政府对私人部门定价管制。其中，纯公共定价是政府直接制定基础产品行业的价格，下列属于纯公共定价范围的是：( )
A.能源 B.交通 C.农业 D.通讯 [单项选择]心肌收缩呈“全或无”特点是因为
A. 动作电位有平台 B. 动作电位时程长 C. 细胞间有闰盘 D. 有自律性 [多选题]电力大件物资是指电源和电网建设中的大型设备或构件，其外形尺寸或质量须符合下列条件之一。（ ）
A.长度大于10m或宽度大于2.5m或高度大于2.0m B.长度大于14m或宽度大于3.5m或高度大于3.0m C.质量在20t以上 D.质量在40t以上 [单选题]A-C-C-001 4 2 3
墩台桩基础埋置深度,承台底面在土中时,在最大冲刷线下不小于( )。 A.1m B.2m C.3m D.4m [单选题]塔式起重机大车行走机构中，行走车轮轮缘的作用是( )
A.降低轮压 B.均匀轮压 C.导向与防出轨 D.增强车轮强度 [单选题]跨度大于( )的钢筋混凝土梁式构件,其底模板应计算起拱高度。
A.4 m B.5 m C.6 m D.7 m [单选题]女性，18岁。月经量多，逐渐面色苍白，乏力，HGB70g/L，部分红细胞大小不等，中心淡染；骨髓铁粒幼细胞减少。
该患者可能的诊断是
A.再生障碍性贫血 B.缺铁性贫血 C.MDS D.巨幼细胞性贫血 E.地中海贫血 [判断题][T AD014 4 3 1
涡街流量计属于容积式流量计。( ) A.正确 B.错误 [多选题]设计速度120km/h以上铁路正线有砟轨道结构应采用( )。
A.Ⅲ型轨枕 B.与Ⅲ型轨枕配套的弹条扣件 C.一级碎石道砟 D.二级碎石道砟 我来回答: 提交
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