××牌94厘米液晶彩色電視機
額定電壓220V
頻率50Hz
功率200W
表所示是小紅家電視機的銘牌,該電視機正常工作時的電壓為    伏,功率是    瓦,電視畫面中的多彩顏色是由藍、    、紅三種色光組成.2011年3月召開的兩會盛況電視報道是通過    向全世界傳播的.(選填“聲波”或“無線電波”)
【答案】分析:掌握電視機銘牌上參數(shù)的含義.
電視機彩色畫面是由光的三原色紅、綠、藍合成的.
聲不能在真空中傳播,電磁波可以在真空中傳播.
解答:解:電視機銘牌上220V表示電視機正常工作電壓是220V,額定功率是200W.
電視畫面由光的三原色紅、綠、藍合成.
兩會盛況是通過衛(wèi)星通信來轉(zhuǎn)播的,太空中是真空,聲波不能在真空中傳播,衛(wèi)星通信依靠電磁波傳遞信息.無線電波是一種電磁波.
故答案為:220;200;綠;無線電波.
點評:本題通過電視機來考查了聲、光、電三部分內(nèi)容,跨越比較大,但是知識點是比較簡單的.
練習冊系列答案
相關習題

科目:初中物理 來源: 題型:閱讀理解

He lived his whole life as a poor man. His art and talent were recognized by almost no one. He suffered from a mental(精神的)illness that led him to cut off part of his left ear in 1888 and to shoot himself two years later. But after his death, he achieved world fame. Today, Dutch artist Vincent van Gogh is recognized as one of
the leading artists of all time.
  Now, 150 years after his birth on March 30, 1853, Zundert, the town of his birth, has made 2003 “The van Gogh Year”in his honor. And the van Gogh Museum in Amsterdam, home to the biggest collection of his masterpieces, is marking the anniversary(周年紀念)with exhibitions throughout the year. The museum draws around 1.3 million visitors every year. Some people enjoy the art and then learn about his life. Others are first interested in his life, which then helps them understand his art.
Van Gogh was the son of a pastor(牧師). He left school when he was just 15. By the age of 27, he had already tried many jobs including an art gallery(畫廊)salesman and a French teacher. Finally in 1880, he decided to begin his studies in art.
Van Gogh is famed for his ability to put his own emotions into his paintings and show his feelings about a scene. His style is marked by short, broad brush strokes(筆畫).“Instead of trying to reproduce exactly what I have before my eyes, I use color more freely, in order to express myself more forcibly,” he wrote in a letter to his brother in 1888.
Van Gogh sold only one painting during his short life. He relied heavily on the support from his brother, an art dealer who lived in Paris. But now his works are sold for millions of dollars. His portrait of Dr. Gacher sold for $89.5 million in 1990. It is the highest price ever paid for a painting. “I think his paintings are powerful and the brilliant colors in them are attractive to people,” said a Van Gogh’s fan.
【小題1】All through his life, Van Gogh __________.
A.depended on his brotherB.worked hard on art studies
C.was not recognized by people D.expressed himself in paintings
【小題2】 Van Gogh killed himself because of ___________.
A.the poor lifeB.his illness
C.his pain from left earD.the objections from the artists of his time
【小題3】 One of the characteristics of Van Gogh’s paintings is ______________.
A.the likeness between his paintings and the reality
B.the short time for him to complete a painting
C.the various styles mixed together
D.the special strokes he made
【小題4】 The selling of his paintings is considered to be the most successful because ________.
A.more and more people like his paintings
B.people can understand him through his paintings
C.1.3 million people visit his painting museum every year
D.Zundert has made 2003 “The Van Gogh Year” in his honor
【小題5】 We can infer from the passage that _______.
A.his powerful art came from his poor life
B.his fellow townsmen regret treating him unfairly
C.a(chǎn)ll his paintings were drawn in the last 10 years of his life
D.most of his paintings are kept in the museum of his hometown

查看答案和解析>>

科目:初中物理 來源: 題型:


五.語法填空 (20分)
Dear Mr. Costa,
I’m sorry it has taken me so long to write. I’ve been very busy with work and school, but I’ve thought about you often.
How have you been (1)       (late)? Did you have a good Christmas and New Year’s? Mac says you’ve been working hard at (2)        restaurant and that business is very good. What else have you been doing?
I had a short (3)        good vacation. Mac and I went to Chicago for a few days before Christmas, but I had to come back and work (4)        Christmas and New Year’s, (5)       (include) Christmas Day and New Year’s Eve! Every time something like that (6)       (happen), I wonder (7)        I really want to work in the hotel business.
The other day I was thinking about the fun (8)        we used to have in our English class. I haven’t seen many of our classmates (9)        the course was over. In fact, the only one I see very often is Tomiko. I’d really like to get in touch with Franco. Does he ever write to you? If so, could you please send me his address?
Well, Mac and I are going skating and he is waiting for (10)       , so I guess I’d better say goodbye now. Write as soon as you can.
Yours ever

查看答案和解析>>

科目:初中物理 來源: 題型:


第二節(jié):語法填空(共10小題,每小題1.5分,滿分15分)
閱讀下面短文,根據(jù)上下文在空白處填上適當?shù)脑~, 或使用括號中的詞語的正確形式填空。
We high school students do have some growing pains, but we can get rid of them correctly and wisely.  31           , some of us are upset  32            their body styles and looks. It’s unnecessary and it’s not important at all. We needn’t care about it. It is one’s inner beauty   33           matters. Second, we sometimes seem to be misunderstood     34             our teachers, parents and classmates.    35        (face) with this, we can find a proper time to have a heart-to-heart talk with them, trying to remove the    36                (understand). Some of us have fewer friends. I think being open-minded and friendly will do you good. Third, we may fall behind others,  37           __ makes us stressed. Actually we can encourage    38             to work  39            (efficiency), full of determination. At last, some of us don’t have much pocket money, so they feel unhappy. Isn’t it strange? So long as we have some, that’s enough. And we can learn  40        to spend money.

查看答案和解析>>

科目:初中物理 來源: 題型:閱讀理解

Have you ever been to a wedding and simply loved the bride’s bouquet(花束)?More than likely some part of it was the Hawaiian Wedding Plant. This foreign houseplant can be enjoyed by anyone, not just brides. With a little proper attention and careful planning on location, this foreign houseplant, which is from Madagascar, can be brought into the home where it can become an interesting focus.
Caring for the Hawaiian Wedding Plant is not much different from caring for any other houseplants that may already be in your home. The only difference between this type of houseplant and others is the amount of the basic requirements that this foreign houseplant needs to survive and perform beautifully. During the growing season, this plant requires its wet soil, but when winter rolls around, this plant needs its soil to be kept drier.
Hawaiian Wedding Plants should also be potted in well-drained(排水)soil and placed in a location that receives full sun. That the soil must be kept wet does not mean that it should sit in water, so the soil must drain easily or this plant will not survive. Water the plant daily and feed this plant every two to three weeks with a little fertilizer(化肥) for acid-loving plants. Prune in early spring, even as early as February. If these needs are met, this plant will stay beautiful.
The most special feature of this foreign houseplant is its long lasting blooms(開花)combined with its unbelievable sweet smell. The Hawaiian Wedding Plant blooms the heaviest in the spring months, but has been known to bloom in any warm months, so do not be surprised to find blooms most time of the year except maybe in the dead of winter.
【小題1】Why does the author mention wedding and bouquet in the first paragraph?
A.To introduce a Hawaiian wedding.B.To attract the readers’ interest in the passage.
C.To show the beauty of the flower.D.To teach the readers to choose proper bouquets.
【小題2】The Hawaiian Wedding Plant comes from________.
A.HawaiiB.ChinaC.MadagascarD.Alaska
【小題3】Which of the following are the growing conditions of Hawaiian Wedding Plant?
a. Wet soil.                b. Lots of fertilizer.                     c. Proper sunshine.        d. Some acid.
A.a(chǎn).cB.a(chǎn). bC.b. cD.a(chǎn). d
【小題4】What does the underlined phrase “in the dead of winter” in the last paragraph probably mean?
A.At the end of the winter.B.At the beginning of the winter.
C.In deadly condition in winter.D.In the coldest part of winter.

查看答案和解析>>

科目:初中物理 來源: 題型:閱讀理解

There was a boy who was sent by his parents to a boarding school (寄宿學校).   36   being sent away, this boy was the   37   student in his class. He was at the top in every   38   always with high marks.
But the boy changed after   39   home and attending the boarding school. His grades started   40  . He hated being in a   41  . He was lonely all the time. And there were especially dark times when he   42   committing suicide (自殺). All of this was because he felt   43   and no one loved him.
His parents started   44   about the boy. But they even did not know what was   45   with him. So his dad decided to travel to the boarding school and   46   him.
They sat on the bank of the lake near the school. The father started asking him some casual questions about his classes, teachers and   47  . After some time his dad said, “Do you know, son, why I am here today?”
The boy answered back, “To   48   my grades?”
“No, no,” his dad replied. “I am here to tell you that you are the most   49   person for me. I want to see you   50  . I don’t care about grades. I care about you. I care about your happiness. YOU ARE MY LIFE.”
These words   51   the boy’s eyes to be filled with tears. He   52   his dad. They didn’t say anything to each other for a long time.
Now the boy had   53   he wanted. He knew there was someone on this earth who cared for him deeply. He   54   the world to someone. And today this young man is in college at the top of his class and no one has ever seen him   55  !
【小題1】
A.AfterB.BeforeC.WhenD.While
【小題2】
A.hardestB.naughtiestC.brightestD.dullest
【小題3】
A.examB.a(chǎn)ctivityC.gameD.class
【小題4】
A.comingB.returningC.leavingD.reaching
【小題5】
A.risingB.increasingC.reducingD.dropping
【小題6】
A.groupB.termC.company D.party
【小題7】
A.led toB.felt likeC.thought backD.looked for
【小題8】
A.worthless B.carelessC.concernedD.a(chǎn)nnoyed
【小題9】
A.caringB.turningC.worryingD.speaking
【小題10】
A.crazyB.trueC.possibleD.wrong
【小題11】
A.talk withB.listen toC.tell toD.care about
【小題12】
A.familyB.friendsC.studyD.grades
【小題13】
A.realizeB.a(chǎn)nalyzeC.checkD.test
【小題14】
A.outstandingB.importantC.famousD.familiar
【小題15】
A.happyB.excellentC.interestedD.satisfied
【小題16】
A.causedB.wantedC.encouragedD.forced
【小題17】
A.a(chǎn)nsweredB.ignoredC.hatedD.hugged
【小題18】
A.nothingB.somethingC.everythingD.a(chǎn)nything
【小題19】
A.showedB.meant C.intendedD.expressed
【小題20】
A.sadB.a(chǎn)ngryC.pleasantD.joyful

查看答案和解析>>

同步練習冊答案