Based on the crystal plasticity theory and mathematical theory of statistics, the relation of flow stress fluctuation quantity to grain dimension as well as billet dimensions was built.

基于晶体塑性理论及数理统计理论，建立了流动应力波动幅度与晶粒尺寸和坯料几何尺寸间的关系。

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As a raw material need in large quantity in oil refining chemical enterprise, catalyst 's price fluctuation is one of factors to influent product cost.

催化剂作为炼油化工企业大量需求的原料，其价格的波动是影响产品成本的因素之一。

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The welding machine has strong anti-electricity fluctuation ability, it is available to produce in small quantity. At the same time, further research should be held on accurancy accouplement.

得出该焊机抗电网波动能力强、可小批量生产，同时还应从精确匹配上进一步研究的结论。

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