最先从经济学视角对创新进行系统性研究和阐述的是美籍奥地利经济_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

最先从经济学视角对创新进行系统性研究和阐述的是美籍奥地利经济学家（）。

A.门格尔

B.熊彼特

C.维塞尔

D.庞巴维克

答案

参考答案：B

补全对话，情景问答

根据图和表格内容，完成对话。

1.	A: Excuse me, can you tell me the ___________ to the shopping centre? B: Go ___________ this street, and then turn left ___________ the fourth crossing. The shopping centre is ___________ your right. You can't miss it. A: Thank you very m.uch. B: That's all right.

	Tom	Nancy	Helen
Height (cm) (身高)	160	155	150
Age (年龄)	12	10	10
High jump (cm) (跳高)	120	100	100
Chinese	中	良	优

A: Who is ___________ than Nancy?
B: Tom is. And he is two years ___________ than Nancy and Helen.
A: Look, Nancy jumps as ___________ as Helen.
B: Yes. Does Helen do ___________ ___________ Chinese?
A: Yes, she ___________.

单项选择题

当使用QPSK编码时，一个码元能承载几个比特的信息？（）

A.4

B.2

C.3

D.1