【单选题】垄断厂商的需求曲线为Q=D(P)=100-2P;成本函数为C(Q)=2Q;则它的最优产量水平是( )
【多选题】Why is the livestock industry so developed in Australia?
A.
It is favored by natural conditions.
B.
It has abundant groundwater resources.
C.
It is highly mechanized.
D.
It is due to its intensive grazing.
【单选题】Why is Australia.s New South Wales called the premier state?()
A.
Because it was the first colony established by Britain in 1788.
B.
Because it is the biggest state in Australia.
C.
Because it is the most important state in Australia.
D.
Because it has the largest population in Australia.
【单选题】测定一个苹果品种的单果重量,得到具有15个观察值的一个样本资料,计算标准差时其自由度为__
【单选题】8255A芯片具有三个独立数据端口,只有_______端口具有双向传输方式。
【简答题】55山东省人文旅游资源丰富,拥有世界级遗产4处,请问它们分别是哪4处?