单项选择题

NK细胞表面识别非MHCⅠ类分子的调节性受体包括

A、KLR
B、KIR
C、NCR
D、NKG2D

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单项选择题

Consider a portfolio exhibiting an expected return of 20% in an economy in which the riskless interest rate is 8%, the expected return to the market portfolio is 0.13, and the standard deviation of the return to the market portfolio is 0.25. Assuming this portfolio is efficient, what is its beta?
A、1.8
B、2.1
C、2.0
D、2.4

A.13,
B.25.
C.8
D.1
E.0
F.4

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