能够对考古资料产生突发性破坏的自然力不包括()A、海啸B、地震C、泥石流D、日晒

题型:单项选择题

问题:

能够对考古资料产生突发性破坏的自然力不包括()

A、海啸

B、地震

C、泥石流

D、日晒

考点:考古学考古与文物考古与文物题库
题型:单项选择题

一束光线垂直射到平面镜上,入射角是______,反射角是______,当将平面镜转动15°时,入射光线与反射光线的夹角是______.

题型:单项选择题

已知复数Z=iCn1+i2Cn2+…+inCnn(其中i为虚数单位),以下判断中正确的为(  )

A.不存在n∈N*,使Z为纯虚数

B.对任意的n∈N*,Z为实数

C.存在无限个n∈N*,使Z为实数

D.不存在n∈N*,使Z为实数

题型:单项选择题

明初,( )是全国棉纺织业中心,城乡妇女普遍纺纱织布,绫(线绫)、布(三梭布)畅销各地,“衣被天下,虽苏、杭不及也”。

A.松江

B.上海

C.南京

D.福州

题型:单项选择题

No one wants to look silly or do the wrong thing at a new job. It’s important to make the right impression (印象) from the first day. You will face new people. You will be in a new place. It may be difficult to know what to do. Here are seven tips to help you make it through the first days at a new job:

1. First impression is important. Make sure you make a good one. Before your first day, find out if your new job has a dress code. If so, be sure to follow it. No matter what you wear, always be neat (整洁) and clean.

2. Get to work on time. Employers value workers who come to work on time. Give yourself an extra 15 minutes to make sure you arrive on time.

3. Pay attention to introduction. One of the first things that your supervisor (主管) may do is to introduce you to co-workers. These co-workers will be important to you. They are the ones who will answer your questions when the boss isn’t around.

4. Ask plenty of questions. Make sure that your supervisor has told you what your are expected to do. If he or she has not told you your job duties, ask for a list. Set daily and weekly goals for yourself.

5. Don't make personal phone calls. You should never make personal phone calls to your friends and family unless it's an emergency.

6. Don’t take too long for lunch. What’s the lunch-hour policy at your new job? You can find out from your supervisor or your company’s personnel department(人事部门). For example, do people eat at their desks or does everyone take a full hour outside the workplace?

7. Never be the first one to leave. Observe how your co-workers behave around quitting (离开) time. It does no good for you to be eager to leave.

小题1:Which is the best title for the passage?

A.Tips On First Days At a New Job

B.How to Do a Job Well

C.Be the Last to Leave

D.Ways to Find a New Job小题2:From the last two paragraphs, we can infer that the most important rule we should follow is ______.

A.to have lunch outside the workplace

B.to do as other people do

C.not to be the first to leave after work

D.to pay attention to introductions小题3:The underlined phrase “a dress code” (Para. 2) means ______.

A.a beautiful dress

B.a place where a dress can be placed

C.a neat and clean dress

D.a rule about what you can wear to work小题4:Which of the following is NOT true according to the passage?

A.You should not make personal calls unless very necessary.

B.Co-workers will be important to you when the boss is out.

C.You shouldn’t ask any questions in case you trouble others.

D.Leave an extra 15 minutes earlier to make sure you won’t be late.

题型:单项选择题

受交变应力的零件发生断裂时的应力,远低于材料的屈服强度。

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