地基抗震承载力一般均大于静力条件下的承载力,这是因为( )。 A.作用是低频作用

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问题:

地基抗震承载力一般均大于静力条件下的承载力,这是因为( )。

A.作用是低频作用 (B) 地

B.地震作用历时较短

C.地震作用为偶然作用,在结构使用期间不一定发生

考点:注册土木工程师岩土工程专业知识专业知识
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若a、b为任意实数且a>b,则下列关系中成立的是(  )
A.a4>b4B.
b
a
<1
C.log5(a-b)>0D.(
1
5
)a<(
1
5
)b
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公路上匀速行驶的货车受一扰动,车上货物随车厢底板上下振动但不脱离底板.一段时间内货物在竖直方向的振动可视为简谐运动,周期为T.取竖直向上为正方向,以某时刻作为计时起点,即t=0,其振动图象如图所示,则      (    )

A.t=T时,货物对车厢底板的压力最大

B.t=T时,货物对车厢底板的压力最小

C.t=T时,货物对车厢底板的压力最大

D.t=T时,货物对车厢底板的压力最小

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Keeping pace with teachers is a fine way to study English.Teachers are experienced and their plans are systematic.But remember to work in a way that suits you.It's important to learn from past mistakes as well.Keep a notebook to make a record of the mistakes you make-it'll help you avoid making the same ones later.

The time of life may be hard,but you're not alone.You may be busy studying,but you can show your care by calling your friends or sending short messages.Don't let your friendships die.

It's as important to live well as it is to study well.Going to bed no later than 11:30 pm is vital.It puts you in the right mood for the next day.You needn't follow a special diet,but make sure you are eating nutritious meals each day.

The person who plays well,studies well.Having a lot of schoolwork doesn't mean having to give up other activities.Playing basketball or having a talk with your classmates can relax yourself.Time_out is not a waste of time but helps you study more efficiently.

Besides taking the big exam,you have other choices for college.I took the independent enrollment exam held by Peking University and some other students even were preparing to study abroad.Pay attention to any relevant information you can find,whether it's from school,the news media or other sources.

小题1:What should you do if you want to keep your friendship fresh?

A.Have frequent talks with them.

B.Always have lunch with them.

C.Remain them at some distance.

D.Keep connection by some ways.小题2:The third paragraph is mainly about________.

A.study

B.friendship

C.relaxation

D.health小题3:Which one is the closest meaning to “Time out” in Paragraph 4?

A.Sleep.

B.Exercise.

C.Continuation.

D.Pause.小题4:The passage is mainly written by a(n)________.

A.editor

B.student

C.teacher

D.parent

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什么是冷却灭火法?

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电气作业人员的基本条件之一:具备必要的()和(),且按工作性质,熟悉安全规程的相关部分,并经考试合格。

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