问题
多项选择题
对等效剪切波速，下述说法中正确的是( )。
A．等效剪切波速为场地中所有土层波速按厚度加权平均值
B．等效剪切波速计算深度为覆盖厚度与20m的较小值
C．等效传播时间为剪切波存地面至计算深度之间的实际传播时间
D．等效剪切波速即加权平均剪切波速
答案
参考答案：B,C
解析： 《建筑抗震设计规范》(GB 50011—2001)第4.1.5条。
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对等效剪切波速，下述说法中正确的是( )。
A．等效剪切波速为场地中所有土层波速按厚度加权平均值
B．等效剪切波速计算深度为覆盖厚度与20m的较小值
C．等效传播时间为剪切波存地面至计算深度之间的实际传播时间
D．等效剪切波速即加权平均剪切波速
参考答案：B,C
解析： 《建筑抗震设计规范》(GB 50011—2001)第4.1.5条。
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| When I was ten, my family moved to a housing project in East Los Angeles. Even though we struggled to make 1 meet, my parents stressed to me 2 fortunate we were to live in a great country with 3 opportunities. They imbued(灌输) in me the 4 of family, faith and love for our country. The following year, my dad, Benjamin, injured his back working in a cardboard-box factory and was 5 as a hairstylist. He rented space in a shopping mall and gave his shop the fancy name of Mr Ben's Coiffiure. The owner of the shopping center gave Dad a discount on his 6 for cleaning the parking lot three nights a week, which 7 getting up at 3 a.m. To pick up trash, Dad used a little machine that looked like a lawn mower (割草机) 8 Mom and I emptied garbage cans and picked up litter 9 I did this job for two years, but the lessons I learned have 10 a lifetime. I learnt discipline, a strong work ethic and a 11 attitude towards life, I also learned at an early age the importance of 12 life's competing interests-in my 13 , school, homework and a job. All 14 helped during my senior year of high school, when I worked 40 hours a week at a fast-food restaurant while 15 precollege courses. The hard work paid off. I attended the U.S. Military Academy and went on to get graduate 16 in law and business from Harvard, 17 I joined a big Los Angeles law firm. In these jobs and in everything else I've done, I have never forgotten those days in the parking lot. The experience has 18 me that there is dignity(尊贵) in all work and that if people are working to 19 themselves and their families, that is something we should 20 . | ||||
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