About 20 of the passengers who were injured in a plane crash are said to be in_____condition .
The destruction of the twin towers _________shock and anger throughout the world .
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In 1991,while t11e economies of industrialized countries met an economic_____,the economies of developing countries were growing very fast .
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The manager is calling on a______ customer trying to talk him into signing the contract .
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After his uncle died ,the young man _____the beautiful estate with which he changed from a poor man to a wealthy noble .
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Many _______will be opened up in the future for those with a university education .
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John says that his present job does not provide him with enough ______for his organizing ability.
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It is estimated that ,currently, about 50,000 species become _____every year .
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His wife has been _______a lot of pressure on him to change his job.
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设随机变量 ( X, Y) 服从二维正态分布,且 X与Y不相关, f ( x) f ( y) X Y 分别表示 X,Y的概率密度, 则在Y=y的条件下, X的条件概率密度f X|Y (X|Y) 为()
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某人向同一目标独立重复射击, 每次射击命中目标的概率为 p(0< p<1), 则此人第 4 次射击恰好第 2 次命中目标的概率为()