The plan of system unit composed of three levels, which are lightwave level, microwave level and TV level, is described.

给出了由光波层、微波层、电视层共三个层次组成的系统单元的方案。

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This text analyze marketing management general plan of channel of Company, EMC of U. S. A. , from three level, find an effectual whole solution of management of marketing channel.

本文将从三个层次分析美国EMC公司的营销渠道的管理方略，找到一个行之有效的营销渠道管理的整体解决方案。

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"Having him behind the plate, that comfort level, getting to spring training I don't have to try to go over my game plan with three or four different catchers, " Marcum said.

WSJ: Marcum and Mets finalize one-year deal