资产组合的贝塔系数与组合内的资产收益率的相关系数有关。( )
参考答案:错
解析: 资产组合的贝塔系数等于资产组合内各资产贝塔系数的加权平均,因此与组合内资产收益率的相关系数无关。
已知平行四边形ABCD的三个顶点为A(-1,2),B(3,4),C(4,-2),点(x,y)在平行四边形ABCD的内部,则z=2x-5y的取值范围是 [ ]
A.(-14,16)
B.(-14,20)
C.(-12,18)
D.(-12,20)
The author believes that it is the test system,________ the teachers, that is to blame for the heavy burden of middle school students.
A.other than
B.or rather
C.rather than
D.more than