【多选题】() are Marshall’s contribution to IO .
A.
Introduce organization as a fourth factor of production
B.
Touched on the issue of Economies of Scale
C.
Made research for product heterogeneity
D.
Put forward the concept of Workable competition
【单选题】接触网短时(5min)最高工作电压为( )kV,最低工作电压为20 kV。
【单选题】反映某市7岁男孩身高的分布特征宜用( )
【简答题】读课文,判断下列句子对(√)错(×)。 ( ) 1. Amy's Mum bought a new TV for the children. ( ) 2. The computer is very nice. ( ) 3. Amy wants to buy a book about computers. ( ) 4. The books about computer...
【简答题】性别、年龄这样的概念,可以用来( )。 A .表示个体的特征 B .作为指标来使用 C .表示总体的特征 D .作为变量来使用
【简答题】根据课文,按顺序排列句子。 ( ) Then we put Christmas things on the tree. ( ) Now let's put our gifts under the tree. ( ) Let's invite Danny to help us put up the tree. ( ) First, we put on the ligh...
【单选题】象“性别”、“年龄”这样的概念,可能用来( )
【单选题】The center of the Marshall's economic system is ( ).
A.
production t heory and distribution theory
B.
d istribution theory and consumption theory
C.
p rice theory and distribution theory
D.
p roduction theory and price theory
【简答题】接触网最高工作电压为27.5 kV,短时(5 min)最高工作电压为( )kV,最低工作电压为19 kV。