【单选题】Short-run fluctuations in output and employment are called:
B.
the classical dichotomy
D.
productivity slowdowns.
【单选题】设某单片机的晶振频率为 12 MHz,则其机器周期为__________。
【简答题】设随机变量X服从正态分布N(u,σ 2 ),试用特征函数的方法求X的3阶与4阶中心矩。
【单选题】Sectoral shifts in demand for output
A.
create structural unemployment.
B.
increase unemployment due to job search.
C.
immediately reduce unemployment.
D.
do not affect demand for labor.
【简答题】医院里用来消毒的酒精是纯酒精和蒸馏水按照3:1的比例配制而成的. (1)要配制这种消毒酒精2000毫升,需要纯酒精和蒸馏水各多少毫升? (2)现有蒸馏水600毫升,应加入纯酒精多少毫升?
【判断题】将医用酒精蒸馏即可得到纯度为99.99%的酒精。
【单选题】Sectoral shifts:
A.
lead to wage rigidity.
B.
explain the payment of efficiency wages.
C.
depend on the level of the minimum wage.
D.
make frictional employment inevitable.
【单选题】Economists call the changes in the composition of demand among industries and regions:
A.
insider-outsider conflicts.