是羽纹硅藻细胞壁上的一个重要结构，壳面中部或偏于一侧具一条纵向的无纹平滑区称为中轴区，中轴区中部花纹较短，形成面积稍大的中心区。在壳面沿纵轴有一条裂缝即为壳缝（Raph）又称纵沟。具壳缝的种类可以行动。
- 羽纹纲硅藻壳面长轴的位置上具无纹的中线,拟壳缝(pseudoraphe)或壳缝(raphe),但有的种类不在壳面的中央,而是偏离中线,靠近壳缘,尤其是管壳缝,位于壳缘,仅..
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与普通水缝式结晶器相比，铸坯温度场均匀，坯壳厚度均匀，冷却强度有所提高。
Comparing to the normal water cooling type mold, spray-type mold is more homogeneous in temperature field and in thickness of solidified shell and is higher in cooling intensity.
塔河油田4区下奥陶统碳酸盐岩岩溶缝洞型油藏的形成与古风化壳的风化剥蚀有关。
The formation of karst? Cavern type carbonate oil reservoirs in lower Ordovician of 4 area in Tahe oilfield is related to weathering? Denudation of fossil weathering crust.
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