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低合金钢焊缝珠光体转变大体发生在A1~555℃之间,碳和铁原子的扩散都比较容易进行,属于()相变。 ["扩散型","共晶","共析","匀晶"]
氨苄西林属于哪一类青霉素() ["耐酸类青霉素","耐酶类青霉素","广谱类青霉素","天然青霉素类"]
单纯性肥胖主要有几种诊断方法() ["A、1种","B、2种","C、3种","D、4种","E、5种"]
文章《湖南农村劳务输出发展现状与对策研究》是以下哪个类型的作品() ["学位论文","会议论文","期刊论文","科技成果"]
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