応力 おうりょく腐食 ふしょくではありませんでした
ōryokufushokudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 応力腐食

1. Was not stress corrosion.; Was not stress-corrosion cracking.

Past/Perfective
Negative
Polite
Formal Register