题目内容
文艺复兴时期杰出油画作品《西斯廷圣母》的作者是
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At fourteen, Dorothea was teaching school at Worcester, Massachusetts. A short after she had begun teaching, she set up a school for young girls in her grandparents' home. Stress was placed on moral (道德) character at Dorothea's school, which she conducted until she was thirty-three.
She was forced to give up teaching at her grandparents' home, however, when she became ill. A few years of inactivity followed.
In 1841 Dorothea began to teach again accepting a Sunday school class in the East Cambridge, Massachusetts, prison. Here she first came upon insane people (精神病人)locked up together with prisoners.
In those days insane people were treated even worse than prisoners. There were only a few madhouses in the entire country. Therefore prisons, poor houses, and houses of correction were used to keep the insane.
Dorothea Dix made a careful investigation (调查) of the inhuman treatment of the insane, which was considered unfeminine for a woman to devote herself to such work at this time. But this did not stop Dorothea Dix from providing proper medical care for the insane.
Gradually, because of her investigations conditions were improved. More than thirty mental institutions were founded or rebuilt in the United States because of the hard work. Dorothea also spread her investigations to England and to other parts of Europe.
During the Civil War, Dorothea served as superintendent (负责人) of women hospital nurses in the Union Army. When the war was over, she returned to her work of improving conditions for in- sane people.
This article is mainly about _______.
【B2】
某房屋中横墙如图，采用混凝土小型空心砌块MU10(孔洞率45%)、水泥混合砂浆Mb5砌筑，施工质量控制等级为B级；截面尺寸为5600mm×190mm；由恒荷载标准值产生于墙体水平截面上的平均压应力为0.5MPa，作用于墙体的水平剪力设计值为200.0kN。
该混凝土空心砌块墙体的受剪承载力，接近下列______组数值？
圆形截面轴心受压柱，直径d=500mm，计算长度l0=5200mm。受轴心压力设计值N=4500kN，混凝土强度等级为C30，纵筋用HBB335级钢筋，箍筋用HPB235级钢筋。
按配有普通纵筋和箍筋柱计算，所需纵向受压钢筋面积A's=______mm2。
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