From the beginning of knowledge basement for teaching, this paper analyzes the origin, connotation and feature of PCK and PCKg.

文章从教学的知识基础出发，分析了学科教学知识以及学科教学认知概念的来源、内涵及特征。

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The latest facelift (unveiled last night with help from Grammy-award winning singer Alicia Keys) comes in the form of a cutting-edge LED lighting system, provided by Philips Color Kinetics (PCK).

FORBES: How To Light The World's Most Famous Office Building

The state-of-the-art dynamic lighting system from PCK is unique to Empire State Building and allows customized light capabilities from a palette of over 16 million colors in limitless combinations along with effects previously not possible such as ripples, cross-fades, sparkles, chasers, sweeps, strobes and bursts.

FORBES: How To Light The World's Most Famous Office Building