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劳动力供给曲线不变时，需求曲线右移，均衡工资率提高，就业量增加。()

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A copy machine makes 60 copies per minute. A second copy machine makes 80 copies per minute. The second machine starts making copies 2 minutes after the first machine starts. Both machines stop making copies 8 minutes after the first machine started. Together, the 2 machines made how many copies？

A. 480
B. 600
C. 680
D. 720
E. 960

劳动力资源是指生活在一定社会和区域的人的总和。()

Quickinform.com will soon introduce a new feature______users to quickly see the most important data.

A. demonstrating
B. executing
C. aliowing
D. preventing

在世界金融衍生工具发展史上，股票指数期货先于利率期货出现。()