testpiece
Just-noticeable difference, the amount by which something must be changed in order for it to be detectable at least 50% of the time.
A piece of material used as a sample in mechanical testing. / (climbing) A difficult climb, one that tests the climber.
(sociology) Opposition to elitism.
present participle of piss off
引張試験の前に、技術者は目に見える欠陥がないか試験片を検査した。
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