【单选题】设某消费者仅消费X、Y两种商品,其价格分别为每单位1元、2元,已知达到消费者均衡时消费最后一单位的Y边际效用为20,则这时消费的最后一单位X的边际效用大约为()。
【单选题】对消费者的购买行为影响最深远、广泛的是()
【判断题】____刮研平面的质量常以25X25平方登米面积内接触点数来表示,
【判断题】刮研平面的质量常以25X25平方毫米面积内接触点数来表示。
【单选题】The ATP-driven Na + pump plays such a central part in the energy economy of animal cells that it typically accounts for _____ or more of their total ATP consumption. This pump uses the energy derived ...
【单选题】设某消费者仅消费X、Y两种商品,其价格分别为3元、2元,已知达到消费者均衡时消费的X为5件,第5件提供的边际效用为27单位,则这时消费的最后一单位Y提供的边际效用为
【单选题】对消费者的购买行为影响最深远、广泛的是( )
【单选题】Which of the following statements about the Na+/K+ pump is FALSE?
A.
It transports Na+ out of the cell and K+ into the cell.
B.
It is present in neurons.
C.
Its activity requires the expenditure of metabolic (cellular) energy.
D.
It transports Na+ and K+ in a 1:1 ratio.
【简答题】作者认为,如果用一个词来形容1912年夏天的纽约布鲁克林,最“恰如其分的”词是( )。