The air after the rain is excellent. I love to _____ ( 吸入 ) the clean air.
举一反三
- 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?
- 词汇与结构 Warm air is less dense than cool air, and _____ air is less dense than dry air.
- The pressure of pilot air is usually （） than that of starting air.
- After the long boring discussion I was (thank) to be out in the fresh air again.
- 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.