Comparative observation with light microscopy and scanning electron microscopy shows: the hatching gland occurs at stage of embryo development.
观察结果表明，胚胎发育期有孵化腺发生。
Aiming at the characteristic of the welding rapid prototyping, a whole hatching and scanning algorithm of the complex section area is presented in the paper. In the algorithm.
本文针对熔焊快速成型技术的特点，在对其截面填充的过程与轨迹规划详细研究的基础上，提出了一整套适合熔焊快速成型的截面填充算法。
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