Assume that in 1990 there were 3,000,000 fourth-graders in the United States. How many fewer of those 3,000,000 students used a computer in school at least once a week in 1994 than in 1990？
A. 100,000
B. 250,000
C. 500,000
D. 600,000
E. 750,000
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When people become aging, they will lose some of their ability to bounce back from disease
A. to improve in health after one's disease and injury
B. to recover from disease and injury
C. to jump after recovering
D. to run fast
决策的正确与否在很大程度上决定了组织的兴衰存亡，所以决策只能成功不能失败。()
A. 正确
B. 错误
盈亏平衡点分析法适用于风险型决策。()
A. 正确
B. 错误
In the preceding figure, each of the four squares has sides of length 2x. If triangle PQR
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