As one center farm in BINGTUAN for example, this paper establishes the linear programming model of optimal equipment of farming machinery system, and discusses the solving process by Excel.

阐述了农业机器大修理经济界限分析时的指标选择问题，在此基础上给出了农业机器大修理周期长度、修理周期与更新经济界限的计算方法。

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Some of the world's most powerful leaders, along with their finance chiefs are meeting at London's ExCel Center to try to forge common ground on tackling the world's economic crisis.

VOA: standard.2009.04.02

The audience of 15, 000 at London's Excel Center applauded the teen.

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