选择题:program designed to destroy data on your computer

题目内容:
program designed to destroy data on your computer which can travel to “infect ” other computers.( )
A.message
B.information
C.hacker
D.virus
参考答案:

已知:现行国库券的利率为5%,证券市场组合平均收益率为15%,市场上A、B、C、D四种股票的β系数分

已知:现行国库券的利率为5%,证券市场组合平均收益率为15%,市场上A、B、C、D四种股票的β系数分别为0.91、1.17、1.8和0.52;B、C、D股票的必

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