第24题: [单项选择]验算地基的抗震强度时,下述说法不正确的是( )。 A. 地基土的抗震容许承载力可取地基土经深宽修正后的容许承载力乘以地基土抗震允许承载力提高系数 B. 柱桩的抗震允许承载力提高系数可取1.5 C. 中密的粉细砂地基中的摩擦桩抗震允许承载力提高系数应取1.5 D. 200kPa≤[σ0]<300kPa的一般黏性土的地基抗震允许承载力提高系数应取 1.3 参考答案:B 答案解析:据《公路工程抗震设计规范》(JTJ 004—89)2.2.1条。
第28题: [填空题]Who usually take care of the elderly people in the United States 参考答案:(their)family members 答案解析:[听力原文]21-30
Who takes care of the elderly in the United States today Many people wrongly believ
第31题: [单项选择]A. Food choices have nothing to do with trash. B. The website will take care of hiking trash. C. Hikers should not leave their trash behind them. D. Smart people do not have to deal with trash. 参考答案:C 答案解析:[解析] Q: What do we learn from the end of the passage