An invention of an Italian professor
A: gave later inventors the idea of moving air around in diving devices.
B: can "clean" the air.
C: was used to remove moisture.
D: was nothing but a plan.
A: gave later inventors the idea of moving air around in diving devices.
B: can "clean" the air.
C: was used to remove moisture.
D: was nothing but a plan.
举一反三
- The air after the rain is excellent. I love to _____ ( 吸入 ) the clean air.
- Sandy derives utility from consuming 'all other goods,' g, and clean air (measured by particulate matter removed per m3), a, as measured by the utility function U(g,a) = g0.6a0.4. The price of 'all other goods' is $20 and the price of clean air (abatement) equals $10. Brian is the only other consumer in the market for clean air and demands 10 units of clean air. What is the market demand for clean air?
- Air pollution is becoming worse. As is known to all, air to us is ________ water to fish. No one can imagine how human being can live without air.
- What does the professor mean when he says this A: Little is known about defining a substance as an air pollutant. B: The substance isn’t an air pollutant when there is a very little in the air. C: The substance can’t be judged to be an air pollutant only from its actual concentration level. D: The actual concentration level means little to peopl
- 词汇与结构 Warm air is less dense than cool air, and _____ air is less dense than dry air.