换热器的类型按按交换方式分包括（）、（）和（）。

A. 浓度差
B. 温度差
C. 压力差
D. 电场或磁场的场强差

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.