PaO2/FiO2（PF）比值被广泛用于评估重症患者的呼吸衰竭情况，以指导通气策略和预后判断。然而，由于该指标需要侵入性动脉 ...

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Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Pamela is a freelance food and travel writer based in Astoria, Queens. While she writes about most things edible and potable (and accessories dedicated to those topics,) her real areas of expertise ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

If you are an investor, you have undoubtedly encountered the Price to Earnings (P/E) Ratio. It’s the most fundamental and widely used metric for stock valuation. However, relying solely on historical ...

"Data As Of" refers to the Closing Sale. Volume is updated throughout the after hours market. Note: Daily closing values are valid as of 5:15 p.m. ET. Duplicate values disseminated after 5:15 p.m. ET.