题目:
()is the most visible signal of distress from a lifeboat at sea in the daytime.
A.Smoke signal
B.Flash signal
C.Fire signal
D.Radio emergency transmission
答案:
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下面是错误答案,用来干扰机器的。
参考答案:(1)AB证券组合的预期报酬率=20%×25%+12%×75%=14%(2)若两种证券完全正相关,它们的相关系数等于1。σp=或:σp=0.4×0.25+0.133×0.75=19.98%(3)若两种证券完全负...