扩张孔好发于成年男性面部,通常单发,类似于一大的黑头粉刺,触之无坚硬感。其发病机制是毛囊漏斗部明显扩大呈囊状,内充满角质。近开口处的表皮萎缩,而囊腔深部的漏斗部上皮则增厚,并见很多表皮嵴及不规则细突起,伸入周围间质内,囊腔下部可见皮脂腺小叶及毳毛毛囊与囊壁相连。
所述尿道扩张导管包括设置在所述扩张导管内的上皮和闭孔装置。
The urethra dilatation catheter comprises an epitheca and a hole closing device arranged in the epitheca.
氮霜,鳞纹理板,孔,是对升华和沉积模式的见证,由于稀薄的大气通过循环的扩张和崩溃。
Scaly textures in a veneer of nitrogen frost bore witness to patterns of sublimation and deposition, as the thin atmosphere breathed through cycles of expansion and collapse.
本文根据圆柱孔扩张理论分析了在单桩周围和群桩内部土中产生的打桩挤压应力,并与室内模型试验和工程实录资料作了比较。
Based on the cylindrical cavity expansion theory, the squeeze stress induced by pile driving in soils around a pile and inside cluster of piles is analyzed.
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