问题
多项选择题
地震时，坚硬地基上的柔性结构一般表现较好，其主要原因有( )。
A．柔性结构较刚性结构抗震能力强
B．震动阻尼小
C．地面卓越周期短
D．结构自振周期长
答案
参考答案：C,D
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地震时，坚硬地基上的柔性结构一般表现较好，其主要原因有( )。
A．柔性结构较刚性结构抗震能力强
B．震动阻尼小
C．地面卓越周期短
D．结构自振周期长
参考答案：C,D
| 阅读短文，判断句子正(T)误(F)。 | |
talk about him, they all call him " Mr Going-to-do". Do you know why? Mr Brown always says he is going to do something, but he never does it. Every Saturday Mr Brown goes to the Smiths' back door and talks to Mr Smith. He always says he is going to do something. " I'm going to clean my house today," he says, or " I'm going to wash my car tomorrow," or " These trees in front of my house are too big. I'm going to cut them down next week." Mr Smith usually says, " Are you, John? " He knows his neighbour is not going to clean his house, or wash his car, or cut down any trees. Then he says, " Well, excuse me, John. I'm going to do some work in the house." And he does. Mr and Mrs Smith often say to their only child Dick, " Are you going to do something? Then do it! Don't be another (另一个) ' Mr Going-to-do'! " ( ) 1. The Browns are the Smiths' neighbours. ( ) 2. Mr Brown always says he is going to do something and he does it. ( ) 3. Mr Smith doesn't think Mr Brown is going to do anything he says. ( ) 4. The Smiths often tell their child not to be another " Mr Going-to-do ". ( ) 5. The neighbours often call Mr Brown " Mr Going-to-do ". |