细胞核的核仁是做什么用的？它由什么构成？ DFC): 位于浅染区周围, 直径为5～10nm的致密纤维, 含有正在转录的RNA分子。 ③ 颗粒区(granular component, GC): 呈致密的颗粒, 直径为15-20nm。位于周边, 代表已合成的核糖体前体颗粒。 ④ 其余结构
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在离子减薄制备的电镜样品中，孔的边缘往往有一些无颗粒区。
Some small grain free regions (GFR) near the hole in the transmission electron microscopic specimen of this material prepared by ion milling was observed.
中国东部工业区处于地图上红色程度最深的区域，表明这里的颗粒物浓度是最高的。
Eastern China's industrial area is just about the reddest part of the map, meaning it has the highest concentration of particulates.
在小颗粒松散磨料的低磨损区，磨损机理主要是微观切削磨损机理，表面有明显的犁沟或者印痕。
In the low wearing area of the loose abrasive of tiny particle, wear mechanism is mainly the micro-cuts wearing mechanism, and the surface has obvious furrow and indentation.
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