在100g碳不完全燃烧所得气体中,CO占1/3,CO2占2/3,且C(s)+1/

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问题:

在100g碳不完全燃烧所得气体中,CO占1/3,CO2占2/3,且C(s)+1/2O2(g)=CO(g);△H=-110.35kJ/mol

CO(g)+1/2O2(g)=CO2(g);△H=-282.57 kJ/mol,与这些碳完全燃烧相比,损失的热量是[     ]

A.392.92kJ

B.2489.44kJ

C.784.92kJ

D.3274.3kJ

考点:化学反应热的计算
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企业发生的废品损失,应计入营业外支出。()

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2001年是中国轮值APEC(亚太经合组织) * * 年,这次会议召开的地点和主题是 [ ]

A.南京新世纪、新挑战:创新、发展

B.上海新世纪、新挑战:参与、合作、促进共同繁荣

C.广州和平、发展、求同存异

D.大连以人为本,可持续发展,反对恐怖主义

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阅读理解。

     As a young girl, Margaret "Mattie" Knight never played with dolls, preferring to make toys for

her brothers instead. In 1849, Knight went to work in a cotton factory where she witnessed a

"shuttle," a device that carries thread back and forth across a textile loom(纺布机), fly off the

machine when the thread broke, striking and killing a young boy about her own age.

     The 12-year-old Knight developed a safety mechanism that made it impossible for a shuttle to

leave the loom. The design was so effective, soon virtually every new power loom carried her

invention, saving countless workers from injury or death. Being so young, she didn't bother to

patent the device, so she never received payment.

     Knight wouldn't make the same mistake later in life when she invented a machine that could

produce flat-bottomed paper bags. Knight had built a small wooden model in her home, but she

needed a metal version to show it could hold up to the stress of mass production. So she hired

Charles Annan to make the full-sized machine for her, only to have him try to claim the patent for

himself. When Knight sued(起诉), Annan's argument was that the design had to be his, because

no woman could possibly understand the complex mechanics. Knight proved him wrong when

she brought back her wooden prototype and explained how every part worked. She won the

case in 1871, making her the second woman to hold an American patent. Over a hundred years

later, her design is still used as the basis for many modern flat-bottom bag machines.

     But that wasn't the last the world heard of Mattie Knight. During her lifetime, she made about

90 inventions and received 26 patents, becoming one of the most productive female inventors of

the 19th century.

1. We can learn from Paragraph 1 that ________.

A. Knight behaved like boys

B. Knight had an unhappy childhood

C. Knight did a poor job of making toys

D. Knight liked inventing things as a child

2. What do we know about Knight's first invention?_______.

A. It is still used today.

B. It brought her great profit.

C. It was made when he was 20.

D. It reduced injuries at textile plants.

3. Knight sued Charles Annan because he _______.

A. stole the wooden model for the machine she invented.

B. failed to make the full-sized machine for her

C. tried to patent her invention for himself

D. kept the metal version for himself

4. What would be the best title for the text?_______.

A. Mattie Knight's fight for her patent

B. A great woman in the 19th century

C. "The female Edison", Mattie Knight

D. Great inventions, great woman

题型:选择题

中学生活充满竞争,学习生活之中难免会感到紧张、产生压力。关于学习压力,以下看法不正确的是 (     )
A.学习压力都是由过度的考试焦虑造成的B.培养正确的学习观念,养成良好的学习习惯

C.学习压力可以极大地提高学习效率D.只有减轻学业负担,才能完全消除学习压力

题型:选择题

尸检组织标本做化学毒物检查时标本处理方法是().

A.标本用70%乙醇固定

B.标本用干净纱布包裹送检

C.标本要洗干净

D.标本不洗放入干净玻璃瓶中送检

E.标本用4%甲醛固定

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