某建筑场地类别为Ⅱ类，设计基本地震加速度为0.4g，设计地震分组_爱下问搜题

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问题单项选择题

某建筑场地类别为Ⅱ类，设计基本地震加速度为0.4g，设计地震分组为第二组，考虑罕遇地震作用下的特征周期应为（）。

A.0.35s

B.0.40s

C.0.45s

D.0.50s

答案

参考答案：C

补全对话，情景问答

给下列的问句选择正确的答语。

( ) 1. What's the time?
( ) 2. What do they do after school?
( ) 3. When are you going to the hospital?
( ) 4. Do you read newspapers?
( ) 5. Shall we go to the museum?
( ) 6. Is there a zoo in your town?
( ) 7. How does your father go to work?
( ) 8. Is your school far away from your home?
( ) 9. What's the weather like tomorrow?
( ) 10. Can you ride a bike?

A. Yes. I sometimes read newspapers.
B. He goes to work by car.
C. No, it isn't.
D. It's going to be snowy tomorrow.
E. Yes, I can.
F. It's ten o'clock.
G. I'm going to the hospital at three o'clock.
H. No, there isn't.
I. They often play football.
J. OK. Let's go.

填空题

氯气走石英灯头的（），氢气走石英灯头的（），两者在灯头前混合燃烧。