下面哪一种资产组合不属于马克维茨描述的有效边界( )
参考答案：B
—Look, here comes your dream girl. Invite her to dance.
—______What if she refuses me?
A．I don’t know
B．Why me?
C．With pleasure
D．So what?
手少阳经是（）
A．脾经
B．心经
C．心包经
D．三焦经
E．肺经
