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【多选题】
证券投资的风险主要有( )A.
利率风险
B.
购买力风险
C.
市场风险
D.
外汇风险
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反馈参考答案：
举一反三
【单选题】All of the following are types of mediated transport EXCEPT one. Identify the exception.
A.
facilitated diffusion
B.
primary active transport
C.
simple diffusion
D.
secondary active transport
【简答题】对于超高、超长的物体,如高耸入云的电视发射塔、幽深的山谷等纵线条景物适合使用哪种镜头拍摄( )。 A .推镜头 B.拉镜头 C.摇镜头 D.固定镜头
【单选题】Total welfare gains from trade to the economy can be measured:
A.
as the sum of consumer and producer surpluses.
B.
as the difference between producer surplus and consumer surplus.
C.
as the sum of consumer and producer surpluses minus taxes
D.
as the net gain in consumer surplus that results from an action that alters a market equilibrium.
【单选题】Which of the following is a likely impact of international migration? a. The native workers in the receiving country gain welfare. b. The receiving country as a whole gains. c. The workers remaining i...
A.
B.
C.
D.
D
【简答题】我们日常所见的白光是波长为（）的可见光。
【判断题】While trade restrictions do provide gains to certain segments in the economy, such restrictions will always lower national welfare.
A.
正确
B.
错误
【单选题】我们日常所见的白光(如日光、白炽光),实际上是波长400~750nm连续光谱的混合光,又称可见光。当波长短于 nm时,称为紫外光,波长长于750nm的光称为红外光。
A.
300
B.
400
C.
500
D.
360
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