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计算题：某选矿厂处理量为3000吨/日，原矿铜品位为1.5%，获得铜精矿重量为180吨，铜品位为20%，求富矿比及铜回收率。

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You install a new USB scanner on a Windows 2000 Professional computer. Two weeks later， the user of the computer informs you that when he scans images with the scanner， the colors do not display correctly. When he prints the scanned images， the colors print correctly. You need to ensure that the scanned images display the correct colors. What should you do？（）

A. In scanners and cameras in control panel， remove the color management profile.
B. In the display properties in control panel， set the Windows color scheme to Windows standard.
C. In the advanced properties of the display properties in control panel， remove all color management profiles.
D. In the display properties in control panel， increase the colors setting.

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糟肉类

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产生麻面缺陷的原因是（）。

A. 入口导卫装偏
B. 入口横梁偏低
C. 冷却水供应不足

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职业病当事人享受什么待遇？

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