The two classes of planar curve generation are DDA(digital differential analyzer)and DCM ( displacement comparison method).

平面曲线的生成算法主要有DDA（数学微分分析器）和DCM（位移比较法）。

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The particle size and distribution were determined by transmission electron microscopy and laser particle size distribution analyzer, ultraviolet-visible absorption curve was also characterized.

通过透射电镜、激光粒度分布仪等测定了纳米颗粒的粒径和分布情况，并对纳米金溶胶的紫外可见吸收曲线进行了研究。

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