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A.explore B. transmit C. resource D. emerge E. yield F. pose G. assumeH.confidence I.inherit J. comprehensiveSam ____the gift of imagination from his family, but he lacked the driving power to take action.

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A.explore B. transmit C. resource D. emerge E. yield F. pose G. assumeH.confidence I.inherit J. comprehensiveThere is widespread concern that the rising unemployment may ____a threat to social stability.

A.explore B. transmit C. resource D. emerge E. yield F. pose G. assumeH.confidence I.inherit J. comprehensiveIt is well known that China is a country with rich natural ______and a very big population.

设有随机变量X和Y,若E(XY)=E(X)E(Y),则X与Y相互独立.

A. 对
B. 错

任何类型的随机变量都有数学期望.

A. 对
B. 错