Which of the following is an example of pure auction market?
() is the production of pure water from sea water by evaporation and re-condensing.
It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but () this amount.
() is the production of pure water from sea water by evaporation and re-condensing.
It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but () this amount.
纯粹寡头(pure oligopoly)