alternating conditions

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Some of the important corrosion standards covered by this committee are: ISO 9227 (corrosion tests in artificial atmospheres - salt spray tests) and ISO 16701 (accelerated corrosion in an alternating conditions of controlled humidity and salt spray), just to name a few.
The match was played in alternating conditions, with wind swirling around inside the stadium when the sun disappead for periods behind clouds.
It's knowing that process (not to be confused with the products that fuel the process) and being able to adapt it to alternating conditions that provide a perpetual compass, much as the diagnostic process guides medical doctors and the inverted pyramid

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