通过分析双焦点聚焦特性对激光焊接质量的影响，论证了双焦点激光焊接技术的特点。
In this paper, analysis the influence of the focusing characteristics for the quality of the laser welding, demonstrate the characteristics of twin-focus welding technique.
本文以C 30为例，分析了粉煤灰双掺混凝土和普通混凝土耐久性指数，论证了粉煤灰双掺混凝土工程应用的可行性。
Taking C30 concrete for example, analysis the durability index of common concrete and co-dope concrete, and proved the engineering application feasibility of fly ash for co-dope concrete.
采用双钢板粘贴式传力方式以及密集植筋传力方式等两种试件端部处理方法，以论证两者在轴拉试验中的可行性。
The feasibility of a glued double-plated grip method and dense corrugated steel bar grip manner is demonstrated by test.
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