Objective to investigate success ratio, anatomy position, air leakage pressure and complications between reusable laryngeal mask LMA classic and single-use LMA Unique.
目的本研究比较了普通喉罩和一次性喉罩放置的成功率，解剖位置、口咽漏气压和并发症。
The pore radius was in nanometer scale, with uniformity and high ratio of depth and radius, so it's ideal mask for one-dimension nanometer materials.
其孔径为纳米级且分布均匀，纵横比大，是合成一维纳米材料的理想模板。
Therefore, a new approximation model for alternating phase shift mask considering shadowing effects was proposed in this paper, and shadowing ratio was redefined.
因此本文针对交替式相移掩模，提出了一种考虑阴影效应的近似模型。
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