p.m.

常见例句

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程南升;潘学仁.;美味侧耳五种酶的同工酶谱在不同菌体组织中的变化[J]
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杨艳辉;邓任生;魏飞;等.;气固并流下行床反应器出入口结构研究现状与展望[J]
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钱伟;候晓华;谢小平;等.;消化性溃疡与黏膜中糖蛋白含量的关系[J]