In the process described by the woman, why is the coal burned
A: To produce a gas containing carbon and hydrogen.
B: To remove impurities from methanol.
C: To heat the reactors.
D: To prevent dangerous gases from formin
A: To produce a gas containing carbon and hydrogen.
B: To remove impurities from methanol.
C: To heat the reactors.
D: To prevent dangerous gases from formin
A
举一反三
- Among the gases in the atmosphere, only the concentration of carbon dioxide may result in preventing heat around the Earth from escaping.
- Ways to produce hydrogen fuel include producing it from nuclear power, biomass, algae, artificial photosynthesis, direct solar and coal gasification.
- Why is more earth's heat blocked from escaping with more carbon dioxide in the atmosphere A: Carbon dioxide prevents the sun's energy from going back into space. B: Carbon dioxide radiates the sun's energy onto the earth. C: Carbon dioxide produces more heat in the atmosphere. D: Carbon dioxide takes in the sun's energy at infra-red wavelengths.
- They took _______ measures to prevent poisonous gases from escaping.
- Solar panels, wind turbines, hydro power and geothermal energy and hydrocarbons (natural gas or coal) can all be used to produce hydrogen (a primary energy).
内容
- 0
Heat the soup for ten minutes, and then _______from the stove. A: you should remove it B: removing it C: to remove it D: remove it
- 1
Ways must be found to prevent the poisonous gases ________ polluting the air. A: in B: on C: from D: at
- 2
中国大学MOOC: _____________ is the process of extracting coal from the ground.
- 3
Carbon dioxide, which makes a ____________ between us and the sun, prevent heat from getting out of the the atmosphere easily, so the earth is becoming warmer. A: difference B: comparison C: connection D: barrier
- 4
We must find ways to prevent the poisonous gases ________ polluting the air. A: in B: with C: from D: of