To compare the effect of helium-oxygen mixtures containing 80%helium or 60%helium on vital capacity(VC) and related index.

比较含80%氦和含60%氦的氦氧混合气体对肺活量及其相关指标的影响。

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This paper presets a simple method for measuring the refractive index of transparent by beams excited from helium-neon laser.

本文给出了用氦氖激光束测量透明板折射率的一种简便方法。

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AIM: To compare the effect of helium-oxygen mixtures containing 80% helium or 60% helium on vital capacity (VC) and related index.

目的：比较含80%氦和含60%氦的氦氧混合气体对肺活量及其相关指标的影响。

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