下列哪个不属于在图层面板中可以调节的参数（） A.透明度 B.编辑锁定 C.显示隐藏

下列事实能说明NH₃•H₂O一定是弱电解质的是（　　）

①常温下，NH₃•H₂O溶液能使酚酞变红；    

②用NH₃•H₂O溶液做导电性实验，灯泡很暗；

③常温下，0.1mol/L氯化铵溶液的pH约为5

④常温下，体积相同且pH相同的NH₃•H₂O溶液和NaOH溶液，与相同浓度的HCl溶液中和时，消耗HCl溶液的体积：前者＞后者．

A．①②③④

B．②③④

C．③④

D．②④

一组学生向放置在天平左右两盘已调节平衡的烧杯中各加入质量相等、溶质质量分数相同的稀硫酸，再向两烧杯中分别加入质量相等的镁和铝（左杯放镁、右杯放铝），待反应完全后，几位学生观察到了不同的现象，你认为可能的是（　　）

A．左边的托盘往下沉

B．右边的托盘往下沉

C．右盘的溶液浓度大

D．左盘、右盘保持平衡

阅读理解

      I told my friend Graham that I often cycle the two miles from my house to the town centre but

unfortunately there is a big hill on the route. He replied, "You mean fortunately." He explained that

I should be glad of the extra exercise that the hill provided.

      My attitude to the hill has now changed. I used to grumble as I approached it but now I tell

myself the following. This hill will exercise my heart and lungs. It will help me to lose weight and get

fit. It will mean that I live longer. This hill is my friend. Finally as I wend my way up the incline I

console myself with the thought of all those silly people who pay money to go to a gym and sit on

stationery exercise bicycles when I can get the same value for free. I have a smug smile of satisfaction

as I reach the top of the hill.

     Problems are there to be faced and overcome. Helen Keller was the first deaf and blind person

to gain a University degree. Her activism and writing proved inspirational. She wrote, "Character

cannot be developed in ease and quiet. Only through experiences of trial and suffering can the soul

be strengthened, vision cleared, ambition inspired and success achieved."

      One of the main determinants of success in life is our attitude towards adversity. From time to

time we all face hardships, problems, accidents, afflictions and difficulties. Some are of our making

but many confront us through no fault of our own. Whilst we cannot choose the adversity we can

choose our attitude towards it.

     The biographies of great people are littered with examples of how they took these kinds of steps

to overcome the difficulties they faced. The common thread is that they did not become defeatist or

depressed. They chose their attitude. They chose to be positive. They took on the challenge. They won.  

1. Which of the following would be the best title of the passage?

A. Attitude makes difference

B. Well begun is half done.

C. The early bird gets the worm.

D. Easier said than done.

2. From Helen Keller's example we can infer that__________.

A. Great people are born to be great and successful

B. Life is hard and difficult so we have to give up

C. We cannot achieve anything with an easy life

D. Practice makes people successful and powerful

3. What do you think the author is most likely to suggest if he/she continues to write?

A. Some examples of our daily life.

B. His stories of overcoming difficulties.

C. Stories of some unlucky great people.

D. Some examples of his friend Graham.

4. The underlined word "adversity " in the fourth paragraph probably NOT refers to ______.

A. problems

B. difficulties

C. hardships

D. advertisements

接触网是在轨道交通领域中，沿轨道线路上方架设，直接供给（）电能的特殊输电线路，通常指的是传统的柔性接触网。

资质、机构与人员管理分项评分评价项目包括（）

A.企业资质和资格

B.安全生产管机构

C.分包单位资质和人员资格管理

D.设备与设施管理

E.供应单位管理