As to returns and risks as well as Sharp Ratio, it is impossible to make correct and reasonable judgement by means of statistic significance.

至于回报和风险，以及夏普比率，是不可能作出了正确的统计意义的手段和合理的判断。

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Conclusion Laser therapy via nasal cavity improved the ratio of CD antigens, and manifested certain clinical significance in the treatment of cerebral embolism.

结论经鼻腔激光照射疗法可改善CD抗原比例，对脑梗死的治疗有一定的临床意义。

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These studies have evident theoretical significance to decrease coal pillar size and enhance recovery ratio, and practical importance to solve the problems of irregular seam mining in our country.

本文研究对减小煤柱尺寸，提高房柱式采煤回采率具有明显的理论指导意义，对解决我国生产矿区面临的不规则区段煤层开采问题具有实际意义。

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