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试问，在抗震设防地区的下列四类房屋中，其中何项需要进行天然地基及基础的抗震承载力验算
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The Teacher’s Influence upon the Development of Attitudes Of all the areas of learning, the most important is the development of attitudes. Emotional reactions as well as logical thought processes affect the behavior of most people. "The burnt child fears the fire" is one instance: another is the rise of dictators like Hitler. Both these examples also point out the fact that attitudes stem from experience. In the one case the experience was direct and impressive: in the other it was indirect and accumulative. The Nazis were filled largely with the speeches they heard and the books they read. The classroom teacher in the elementary school is in a strategic position to influence attitudes. This is true partly because children acquire attitudes from those adults whose words they respect. Another reason, it is true that pupils often study somewhat deeply a subject in school that has only been touched upon at home or has possibly never occurred to them before. To a child who had previously acquired little knowledge of Mexico, his teacher’s method of handling such a unit would greatly affect his attitude toward Mexicans. The media which the teacher can develop healthy attitudes are innumerable. Social studies (with special reference to races, beliefs and nationalities), science matters of health and safety, the very atmosphere of the classroom, these are a few of the fertile fields for the education of proper emotional reactions. However, when children come to school with undesirable attitudes, it is unwise for the teacher to attempt to change their feelings by scolding them. She can achieve the proper effect by helping them obtain constructive experiences. To illustrate, first grade pupils’ afraid of policemen will properly alter their attitudes after a classroom chat with the neighborhood officer in which he explains how he protects them. In the same way, a class of older children can develop attitudes through discussion, research, outside reading and all day trips. Finally, a teacher must constantly evaluate her own attitudes, because her influence can be harmful if she has personal prejudices. This is especially true in respect to controversial issues and questions on which children should be encouraged to reach their own decisions as a result of objective analysis of the facts. The author writes this passage primarily in order to show us that ______.
已知某工程场地地基土抗震计算参数如表所示。 场地土层参数 层序 岩土名称 层底深度 (m) 层厚 (m) 土(岩)层平均剪切波速 (m/s) 地基承载力特征值 (kPa) 1 杂填土 1.10 1.10 92 2 黏性土 e=0.97，I L =0.58 2.30 1.20 92 100 3 淤泥 27.50 25.20 100 50 4 淤泥质土 29.00 1.50 154 70 5 黏性土 33.70 4.70 158 135 6 粉质黏土 35.40 1.70 225 7 全风化流纹质凝灰岩 58.75 23.35 352 8 强风化流纹质凝灰岩 64.20 5.45 412 9 中风化流纹质凝灰岩 87.50 23.30 514 依据上表及通过计算求得的正确的等效剪切波速，试确定场地覆盖层厚度和场地类别，并指出下列何组答案的全部内容是正确的
已知股票A和股票B的部分年度资料如下(单位为%)：概率(%)A股票收益率(%)B股票收益率(%)102613101121201527252741202122153232 要求： (1)分别计算投资于股票A和股票B的平均收益率(精确至万分之一)。 (2)分别计算投资于股票A和股票B的标准差(保留四位小数)。 (3)假定股票A和股票B收益率的相关系数为0.5，计算A股票和B股票的协方差(精确至万分之一)。 (4)假定股票A和股票B收益率的相关系数为0.5，如果投资组合中，股票A占40%，股票B占60%，该组合的期望收益率和标准差是多少 (精确至万分之一) (5)已知市场的标准差为0.2530，上述投资组合与市场的相关系数为0.8，无风险利率5%，市场的风险收益率为8%，确定该投资组合的必要收益率(精确至万分之一)。
某公司年终利润分配前的股东权益项目资料如下：股本—普通股(每股面值2元，200万股)400万元资本公积160万元未分配利润840万元所有者权益合计1400万元 公司股票的每股现行市价为35元，每股收益为3.5元。 要求计算回答下述四个互不相关的问题： (1)计划按每10股送1股的方案发放股票股利，并按发放股票股利后的股数每股派发现金股利0.2元，股票股利的金额按现行市价计算(市价超过面值的部分计入资本公积)。计算完成这一分配方案的股东权益各项目数额。 (2)若按1股分为2股的比例进行股票分割，计算股东权益各项目数额、普通股股数。 (3)假设利润分配不改变市净率(每股市价/每股净资产)，公司按每10股送1股的方案发放股票股利，股票股利按现行市价计算，并按新股数发放现金股利，且希望普通股市价达到每股30元，计算每股现金股利应有多少 (4)为了调整资本结构，公司打算用现金按照现行市价回购4万股股票，假设净利润和市盈率不变，计算股票回购之后的每股收益和每股市价。
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