問答題
2、 The word ( ) itself usually refers to the deterioration of metals and ceramics, while similar phenomena inplastics generally called ( ) B. recrystallization...degradationD.corrosion... degradation
2、 The word ( ) itself usually refers to the deterioration of metals and ceramics, while similar phenomena inplastics generally called ( ) B. recrystallization...degradationD.corrosion... degradation
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