This article does some deeply research on theories and techniques of sketch recognition about geometrics and designs a function model system.
本文对手绘几何图形识别理论与技术进行了深入研究，并设计实现了相应功能的原型系统。
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The mechanical properties of improved double-base propellants enabled one to envisage grain geometrics with large combustion areas and consequently high thrusts .