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2021
It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.
In recent years, the automotive industry has developed rapidly, and the lack of oil resources and the increasingly serious environmental pollution caused by car exhaust emissions pose serious problems for its further development. Hydrogen, as an alternative motor fuel, has its own unique advantages in improving fuel economy and reducing harmful gas emissions. However, we cannot directly use hydrogen as an alternative fuel because of its high cost. properties.