∵x2+2y2=6,∴x26+y23=1,
∴椭圆x2+2y2=6的离心率e=ca=6-36=22.
故选B.
维生素A与三氯化锑的呈色反应,其生成物的颜色为
A.蓝色B.紫红色C.蓝色渐变成紫红色D.黄色E.黄色变成桃红色
All of the following are benefits of derivatives markets EXCEPT:()
A. transactions costs are usually smaller in derivatives markets, than for similar trades in the underlying asset.
B. derivatives markets help keep interest rates down and supply valuable price information.
C. derivatives allow the shifting of risk to those who can most efficiently bear it.