小明同学在探究“压力的作用效果与压力大小的关系”时,做了如下图甲、乙所示的实验.

题型:实验题

问题:

小明同学在探究“压力的作用效果与压力大小的关系”时,做了如下图甲、乙所示的实验.

(1)实验能够得到的结论是                                            

(2)若想继续探究“压力的作用效果与受力面积大小的关系”,应再作图     (填“丙”或“丁”)所示实验.

考点:压强的定义
题型:实验题

已知液氨的性质与水相似,25℃时,NH3+NH3NH4++NH2-,NH4+离子的平衡浓度为1×10-15mol/L,则下列说法中正确的是                                                                     (   )

A.在液氨中加入NaNH2可使液氨的离子积变大

B.在液氨中加入NH4Cl可使液氨的离子积减小

C.在此温度下液氨的离子积为1×10-30

D.在液氨中放入金属钠,可生成NaNH2

题型:实验题

Iu口分为()和()两部分。

题型:实验题

2008年1月,我国部分地区出现了50年一遇的严重雪灾,这给人民群众的出行制造了极大的麻烦.为防止路面积雪路滑,常在路面撒融雪剂使雪融化,融雪剂的成分有氯化钠、氯化钙、氯化镁等.下列说法正确的是(  )

A.融雪剂的融雪原理主要是盐类溶解放热

B.融雪剂的融雪原理主要是盐类的水解

C.使用融雪剂融化的雪水会使多数植物生长茂盛

D.含有融雪剂的雪水在钢筋混凝土中可形成原电池,对这种结构的桥梁造成腐蚀

题型:实验题

Barditch High School decided to an All-School Reunion. Over 450 people came to the event. There were tours of the old school building and a picnic at Confederate Park. Several former teachers were on hand to tell stories about the old days. Ms. Mabel Yates, the English teacher for fifty years, was wheeled to the Park.

Some eyes rolled and there were a few low groans(嘟囔声)when Ms.Yates was about to speak. Many started looking at their watches and coming up with excuses to be anywhere instead of preparing to listen to a lecture from an old woman who had few kind words for her students and made them work harder than all the other teachers combined.

Then Ms. Yates started to speak:

“I can’t tell you how pleased I am to be here. I haven’t seen many of you since your graduation, but I have followed your careers and enjoyed your victories as well as crying for your tragedies. I have a large collection of newspaper photographs of my students. Although I haven’t appeared in person, I have attended your college graduations, weddings and even the birth your children, in my imagination.”

Ms. Yates paused and started crying a bit. Then she continued:

“It was my belief that if I pushed you as hard as I could, some of you would succeed to please me and others would succeed to annoy me. Regardless of our motives, I can see that you have all been successful in you chosen path.”

“There is no greater comfort for an educator than to see the end result of his or her years of work. You have all been a great source of pleasure and pride for me and I want you to know I love you all from the bottom of my heart.”

There was a silence over the crowd for a few seconds and then someone started clapping. Tee clapping turned into cheering, then into a deafening roar(呼喊). Lawyers, truck drivers, bankers and models were rubbing their eyes or crying openly with no shame all because of the words from a long forgotten English teacher from their hometown.

小题1:What activity was organized for the school reunion?

A.Sightseeing in the park.

B.A picnic on the school playground.

C.Telling stories about past events.

D.Graduates’ reports in the old building.小题2:What can be inferred from Paragraph 2? 

A.Some graduates were too busy to listen to Ms. Yates’ speech.

B.Many graduates disliked Ms. Yates’ ways of teaching.

C.Some people got tired from the reunion activities.

D.Most people had little interest in the reunion.小题3:We can learn from Ms. Yates’ speech that she _____________.

A.kept track of her students’ progress

B.gave her students advice on their careers

C.attended her students’ college graduations

D.went to her students’ wedding ceremonies小题4:What was Ms.Yates’ belief in teaching teenagers?

A.Teachers’ knowledge is the key to students’ achievements.

B.Pressure on students from teachers should be reduced.

C.Hard-pushed students are more likely to succeed.

D.Students’ respect is the best reward for teachers.小题5:Which of the following can best describe Ms. Yates?

A.Reliable and devoted.

B.Tough and generous.

C.Proud but patient.

D.Strict but caring.

题型:实验题

以下关于解压缩软件WinRAR说法正确的是________.

A.可以生成扩展名是。ARJ的压缩文件

B.电脑中没有安装WinRAR软件也可以运行自解压文件

C.运行自解压文件时不能指定解压后文件存放的路径

D.设置密码可以保护压缩文件

E.设置密码的压缩文件,在不知道密码的情况下不能被复制

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