【单选题】单向半波可控整流电路,变压器次级电压为 U 2 ,则整流晶体管实际承受的最高反向电压为( )。
【判断题】The bullwhip effect moves a supply chain away from the efficient frontier by increasing cost and decreasing responsiveness.
【判断题】扩展库pandas的DataFrame数据中的字符串列支持str接口,该接口提供了center、contains、count、endswith、find、extract、lower、split等大量属性和方法。
【判断题】扩展库pandas的DataFrame数据中的字符串列支持str接口,该接口提供了center、contains、count、endswith、find、extract、lower、split等大量属性和方法。
【单选题】有关长期菲利普斯曲线说法正确的是( )
C.
菲利普斯曲线反映了通货膨胀率于失业率之间的替代关系
【单选题】Over time, the wealth of society increases and payments technologies get more efficient. What is the effect on money demand of these two changes?
A.
Money demand rises proportionately to the rise in wealth.
B.
Money demand rises, but less than proportionately to the rise in wealth.
C.
The overall effect is ambiguous.
D.
Money demand declines.