电视机的增益主要靠()放大器解决。

题型:填空题

问题:

电视机的增益主要靠()放大器解决。

考点:电子与通信技术电视机原理电视机原理题库
题型:填空题
阅读理解。
      K.L. Rothey, 71, from the United States, a retired lawyer 
      Rothey has given himself the Chinese name of Luqi or "roadside beggar (乞丐)". In his eyes, beggars
are doing important work collecting rubbish. What they do is not dirty. Littering the street is, he adds.
      Rothey first visited China in 1984 and soon he became interested in Chinese culture. Married to a Chinese
calligrapher (书法家), he lived in Huangshi, Hubei Province.
      Many people know him because he often shows up in the street collecting rubbish."Huangshi is my home
so I hope it becomes cleaner and more beautiful," says Rothey. He has also organized volunteers to collect
rubbish in other cities, including Wuhan.
      Rothey says he'll continue collecting rubbish, as long as he is able to. 
      Jill Robinson, 50, from Britain, founder (创立者) and CEO of Animals Asia Foundation. She has been
working for nearly 20 years to stop people from getting the bile (胆汁) from moon bears for use in traditional
medicine.
     She began working for the International Fund for Animal Welfare in Hong Kong in the mid-1980s. A
business trip to a bear farm in the mainland in 1993 changed her life. She saw so many moon bears killed by
people. That made her cry. She said she would be back to set them free.
      In 1998, she set up the Animal Foundation. In July 2000, the foundation agreed to free 500 farmed moon
bears. In 2002, the Moon Bear Rescue(救援) Center was set up in Chengdu, capital of Sichuan.
      Now, bear farms have been sto pped in the area of two-thirds of China. "As much as we rescue them,
they rescue us. These bears rescue us every single day and they teach us to be better people," Robinson says.
Name K.L.Rothey Jill Robinson
Nationality 1______British
Age 7150
Events He first visited China in 1984 and
became interestedin Chinese culture.
He often 2______ in the streets in
Huangshi. He has also organized
volunteers to collect rubbish in other
cities.
     She began working for the
International Fund for Animal Welfare
in the mid-1980s. 3______ in the
mainland changed her life in 1993.
She set up the Animal Foundation in
1998. In 2002, the Moon Bear Rescue
Center was set up in Chengdu, capital
of Sichuan.
     The two passages are about two foreigners who have helped improve Chinese lives with their
contributions (贡献). We should 4______ them and do what we can to protect the environment.
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一物体从地面竖直向上抛出,在运动中受到的空气阻力大小不变,下列关于物体运动的速度v随时间t变化的图像中,可能正确的是(   )

题型:填空题

用NA代表阿伏加德罗常数,下列说法正确的是     (     )

A.12g金刚石中所含的共价键数为4NA

B.标准状况下,11.2L SO3所含的氧原子数为1.5NA

C.常温下,1L0.1mol/L的NH4NO3溶液中铵根离子为0.1 NA

D.1mol 过氧化氢分解转移NA电子

题型:填空题

关于循证医学的说法错误的是()

A.循证医学指以科学研究为依据来处理疾病

B.循证医学不等于随机对照的临床研究

C.循证医学将取代传统医学

D.循证医学强调使用最佳的证据

E.通过循证医学知道临床实践要经历提出问题、寻找证据、评价证据、实施证据、疗效评价

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为什么要建立交接班制度?

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