有两根电热丝R1和R2,Rl=10Ω,R2=40Ω,采用下列四种方式分别接到36

题型:不定项选择

问题:

有两根电热丝R1和R2,Rl=10Ω,R2=40Ω,采用下列四种方式分别接到36 V的电源上,通电5 min,产生热量最小的连接方式是[ ]

A.R1、R2串联

B.R1、R2并联

C.只接入R1

D.只接入R2

考点:电阻的串联电阻的并联电功率的计算
题型:不定项选择

Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with word or phrases that best fits the context.

When other nine-year-old kids were playing games, she was working at a petrol station. When other teens were studying or going out, she struggled to find a place to sleep on the street. But she overcame these terrible setbacks to win a highly competitive scholarship and gained 36___ to Harvard University. And her 37___story has inspired a movie, Homeless to Harvard: The Tony Morrison Story 38___ in late April.

Tony Morrison, a 22-year-old American girl, has been writing a real-life story of willpower and determination. Tony grew up in the 39___of two drug-addicted parents. There was never enough food or warm clothes in the house. Tony was the only member of the family who had a job. Her mother had AIDS and died when Tony was just 15 years old. The effect of that loss 40___ a turning point in her life. Connecting the environment in which she had grown up with how her mother had died, she decided to do something about it. Tony went back to school. She 41___ herself into her studies, never telling her teachers that she was homeless. At night, she slept on the streets.

“What drove me to survive had 42___to do with understanding, by understanding that there was a whole other way of being. I had only experienced a small part of the society,” she wrote in her book Breaking Night. She admitted that she used envy to drive herself on. She used the benefits that came easily to others, such as a safe living environment, 43___ herself that “next to nothing could hold me 44___”. She finished high school in just two years and won a full scholarship to study at Harvard University.

But Tony decided to leave her top university for a couple of months earlier this year in order to take care of her 45___, who has also developed AIDS. “I love my parents so much. They are drug addicts. But I never forget that they love me 46___.” Tony wants moviegoers to go away with the idea that changing your 47___ is “as simple as making a decision”.

36. A. permission           B. entry                C. honor              D. confidence

37. A. puzzled               B. puzzling            C. amazing            D. amazed

38. A. published             B. appeared           C. sold               D. shown

39. A. charge                      B. face                 C. middle            D. shadow

40. A. lay in                 B. led to                      C. referred to          D. stuck to

41. A. threw              B. put               C. devoted           D. concentrated 

42. A. nothing               B. everything                  C. something         D. anything

43. A. to encourage                 B. to control         C. to persuade         D. to believe

44. A. up                      B. down                      C. off                    D. back

45. A. mother                B. sister               C. father                 D. brother

46. A. once in a while                                   B. time and time again  

C. at the same time                                D. all the time

47. A. life                     B. university            C. way              D. family

题型:不定项选择

婴儿均化食品,含猪肉30%,白菜60%,其他与料10%,500g零售包装 ( )

题型:不定项选择

某企业生产一种产品,单价12元,单位变动成本6元,固定成本3000元,销售量1000件,所得税率30%。欲实现目标税后利润1400元,若其他因素不变,企业可采取的措施有( )。

A.固定成本降低至4000元以下

B.单价提高至11元以上

C.销量增加至1000件以上

D.所得税率下调0.5%

E.单位变动成本降低至7元以下

题型:不定项选择

巴黎和会的召开是在()

A、1915年

B、1917年

C、1919年

D、1921年

题型:不定项选择

决定股票价格高低的基本因素是()。

A、政治因素

B、投机因素

C、公司经营状况

D、宏观经济因素

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