vernal.meng 发表于 2023-6-27 10:11 9 D( V- z, f' G$ g外文IEC/EN/UL定义弯曲一次:A flexing is one movement of 90°. " `' H* ]$ n" n% i1 L% n中文GB定义弯曲一次:一次弯曲为一个90 ...