热点试题

[ 化学 ] 用下面两种方法可以制得白色的Fe(OH)2沉淀。 方法一:用不含Fe3+的FeSO4溶液与

用下面两种方法可以制得白色的Fe(OH)2沉淀。
方法一:用不含Fe3+的FeSO4溶液与用不含O2的蒸馏水配制的NaOH溶液反应制备。
(1)除去蒸馏水中溶解的O2常采用___________ 的方法。
(2)生成白色Fe(OH)2沉淀的操作是用长滴管吸取不含O2的NaOH溶液,插入FeSO4溶液液面下,再挤出
NaOH溶液。这样操作的理由是_______________
方法二:在下图所示装置中,用NaOH溶液、铁屑、稀H2SO4等试剂制备。
(3)在试管I里加入的试剂是________。
(4)在试管Ⅱ里加入的试剂是___________。
(5)为了制得白色Fe(OH)2沉淀,在试管I和Ⅱ中加入试剂,打开止水夹,塞紧塞子后的实验步骤是_________________
(6)这样生成的Fe(OH)2沉淀能较长时间保持白色,其理由是________________。

2016-05-17 | 0

[ 历史 ] 下图是唐朝画家阎立本的《_________》,图中场景描绘的是唐太宗接见________派

下图是唐朝画家阎立本的《_________》,图中场景描绘的是唐太宗接见________派来的求婚使者。

2016-05-17 | 0

[ 数学 ] 据统计,在香港的美国人和其他外国人约为13.56万人,你认为这个数字( ) A.精确到万位

据统计,在香港的美国人和其他外国人约为13.56万人,你认为这个数字(  )
A.精确到万位 B.精确到百分位
C.精确到百位 D.精确到千位

2016-05-17 | 0

[ 语文 ] 我能写出下列词语的反义词。对——( ) 深——( ) 朋友——( )轻——( ) 紧——(

我能写出下列词语的反义词。
对——(  )  深——(  )  朋友——(  )
轻——(  )  紧——(  )  严寒——(  )

2016-05-27 | 0

[ 语文 ] 课间,你在校门口遇到一位找校长的人,请你按自己学校的实际情况,给这个人指一下路。     

课间,你在校门口遇到一位找校长的人,请你按自己学校的实际情况,给这个人指一下路。
                                                                                                                                                           

2016-05-27 | 0

[ 英语 ] --- I hear that Jason is planning to buy a ne

--- I hear that Jason is planning to buy a new car.
--- I know. By next month, he ________ enough for a used one.
A.has savedB.savesC.will be savingD.will have saved

2016-05-29 | 0

[ 英语 ] 27.---Where have you been   ---I got caught i


27.---Where have you been?  
---I got caught in traffic, otherwise I _______ here earlier.
A.would beB.have beenC.had beenD.would have been

2016-05-29 | 0

[ 英语 ] Children are very, very observant and have ex

Children are very, very observant and have excellent memories.
Around Christmas last year, we were heading to Grandma’s house. The drive was an hour long, so we had plenty of time to chat. We were waiting to get onto the freeway when my daughter Hayley noticed a homeless man, no sign in hand. “Mom, is that man homeless?” I told her I believed he was.
We got onto the freeway and drove away. But the chatting had stopped. Hayley was quiet all the way there. We spent a few hours at Grandma’s then packed up to head home. As we drove back, Hayley rustled(沙沙作响地移动) around in her seat, trying to reach something on the floor of the car. I asked her to sit still, worried her seatbelt would slip from the booster seat. She mumbled(咕哝)something and sat back.
“Mom, will the homeless man still be outside tonight?” I told her I was not sure, maybe. It was a freezing night, and I started to think of the man now too, and how cold he must be.
All of a sudden, as we got onto the freeway exit, Haley shrieked (尖叫): “There he is! There he is!” and started rolling down her window. “Mom, I found these gloves and scarf back here. Can I give them to him? Can I?” she asked.
I pulled over to the edge of the road, and beckoned(招手示意) the man to come over. Haley smiled at him and handed him her gift. I looked in the front passenger seat, loaded with leftovers from Grandma’s house, and handed those out to him as well.
The man thanked us, he clutched (抓紧) my hand in his and I could feel the bitter cold of them. We wished him a safe night and continued on our journey to our warm home.
“Haley, that was very sweet of you!” I told her. “Well, they were your gloves and scarf, Mom, but his hands looked colder, and he has to keep looking for his house!”
We had talked about homelessness before , and I could hear myself telling her: “Someone who has lost their home.” She had taken my words literally and thought the man’s home was like a lost puppy.
On the ride home, and as I carried my sleeping angel into the house that night, my heart filled with gratitude.
小题1:The underlined word “observant” in Paragraph I means “      ”.
A.fond of serving othersB.quick at noticing things
C.good at memorizingD.easy to be pleased
小题2:The girl thought “a homeless person” was a person who       .
A.had no home to go to
B.had lost his or her puppy
C.was in need of gloves and scarves
D.couldn’t find his or her home
小题3:The mother felt thankful because        .
A.she felt lucky to have such a warm-hearted daughter
B.she was pleased that she had a great family
C.she felt happy to have given the leftovers to the man
D.they had arrived home safely despite the cold
小题4:The article is mainly structured around        .
A.analysisB.comparison C.time orderD.cause and result

2016-05-29 | 0

[ 英语 ] BDU — www. chinadaily. corn. cn / bdu CHINA D

BDU — www. chinadaily. corn. cn / bdu CHINA DAILY LANGUAGE
BDU—BUSINESS DAILY UPDATE
Want to keep well informed about the dynamic (充满活力的) pulse of China’s economy?
Get a glimpse of the most important business activities taking place here every day through Business Daily Update, a service offered by China Daily information via the World Wide Web.
Placed under 10 categories, over 25 news items appear each day with the top three events lighted all in English. Busi­ness Daily Update is just a few mouse clicks away.
Subscribe to BDU for an annual fee of  US $240. E-mail and fax services are also available upon request.
For more information, please contact Business Daily Update:
Tel: (010)64941107,(010)64924488
Fax:+86-10-64941125
E-mail: bdu@ chinadaily. corn. en
Url:http://www. chinadaily. corn. cn/bdu
1. If you get into BDU, you can ________.
A. know everything in China          B. get all kinds of information in the world
C. get the information in China Daily   D. get all the information out of China
2. This ad will be very important to ________.
A. foreign business people                B. foreign magazines
C. Chinese teachers                   D. China Daily reporters
3. To get the information from BDU every day, you must________.
A. understand newspapers                     B. recognize the mouse
C. know how to operate a computer   D. buy a fax machine

2016-05-29 | 0

[ 英语 ] 阅读理解.      America has long been considered t

阅读理解.
     America has long been considered the land of opportunity(机遇)by those from
other countries. Americans, too, believe that the United States gives almost limitless
opportunity for those who want to open business on their own.
     Today, Americans are still fond of trying their hand at becoming small business
people, even though only one out of two survives in the first two years. Many of these
people start their business for the wrong reason: to get away from the paper work of
their present jobs or to exchange the responsibility(责任)of their present jobs for free
life styles. But more, not less paper work and responsibility come with the ownership
of a small business.
     Not all small businesses succeed. Fifty percent of the 4,550,000 that start in the
United States ever fail(失败). Still ninety-five percent of businesses in the U.S. can
be regarded as small, and these businesses altogether produce forty percent of
America's total national products.
1. According to the passage, which of the following statements is TRUE?______
A. People from other countries and Americans think there are a lot of
opportunities in theU.S.
B. Only the Americans think the U.S. can give them many opportunities.
C. Both people from other countries and Americans believe they have many
opportunities in the U.S so that they can do whatever they like.
D. People from other countries and Americans all think the U.S. the place where
they can realize their dreams.
2. From this passage, we know that ____.
A. many people from other countries think that in the past there were many
opportunities in the U.S. but not now
B. now Americans don't believe the U.S. can give them a lot of opportunities
C. people from other countries still think they have more opportunities in the
U.S. than in their own countries
D. Americans think they have more opportunities to start their own business than
those from other countries
3. According to this passage, many American people like to start their own
business because ____.
A. they want to become rich soon
B. they not only dislike their present job but also want a free life style
C. they don't want to do paper work
D. they want to have more chances
4. From this passage, we can get the idea that ____.
A. it is easy to do business successfully in the U.S.
B. it is easy to start a business but hard to make it successful
C. there are more big businesses than small businesses in the U.S.
D. only big businesses can succeed in the U.S.

2016-05-29 | 0