吸收本质上是混合气体组分从（ ）到（ ）的相间传质过程。、
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质量传递的推动力包括（）
A. 浓度差
B. 温度差
C. 压力差
D. 电场或磁场的场强差
Used cars sell for much less than new cars because
A. of imperfect competition in the automobile industry.
B. buyers know much more about the quality of used cars than sellers do.
C. sellers know much more about the quality of used cars than buyers do.
D. physical depreciation of used cars is very high.
E. of licensing arrangements by the government.
The problem of adverse selection in insurance results in a situation in which
A. people choose inappropriate or inadequate coverage because they do not understand the complex information in the policies.
B. people choose too much coverage because they do not understand the complex information in the policies.
C. people choose too little coverage because they do not understand the complex information in the policies.
D. unhealthy people become more likely to buy insurance than healthy people, which drives premiums up, which drives even more healthy people away from the market.
E. healthy people become more likely to buy insurance than unhealthy people, which drives premiums up, which drives even more unhealthy people away from the market even though they are the ones who need it most.
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