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为什么说化石具有保存的不完备性?

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An insurance customer installs two BladeCenter chassis in a rack with glass doors. After a short time, the blowers in both BladeCenters increase to full speed, and then one fails. Apart from replacing the broken blower, which additional action is required for a long term fix of the following?()

Add Rear Door HeateXchanger
B. Add fans to the top of the racks
C. Increase circulation from Data Center raised floor
D. Change to perforated door

专业商店是一种产品浅深而长的商店。

A. 正确
B. 错误

文艺复兴时期达芬奇提出的美论是()。

A. 有意味的形式
B. 神圣的比例
C. 整体与适当
D. 鲜艳的色彩

三相四线制供电电焊机的不带电金属外壳应采用().

A. 保护接零
B. 保护接地
C. 两者并用

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