Presents the core part structure, heat and mass transfer mechanism, and application conditions of the heat exchanger.

介绍了板翅式换热器的芯体结构、传热传质机理、适用条件。

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The metal structure is important part and key of designing and producing the heat exchanger's extracting core machines.

换热器抽芯机主体金属结构是换热器抽芯机最重要组成部分，也是换热器抽芯机设计与制造的关键。

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The core and coritivity method of network systems is a new tool for network system structure optimization , which find first the "core part"and, then optimize the networks based on core part.

网络系统的核与核度方法是一种首先抓住系统“核心部分”，然后在“核心部分”的基础上进一步优化网络系统结构的一种新方法。

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In much the same way as the Mittelstand, Japan's chuken kigyo is not simply a part of the national economy, but the core of its industrial structure.

ECONOMIST: Japan's technology champions