下列科技成果,对世界人类文化进步贡献最大的是 [ ]
A.造纸术的发明与改进
B.张衡发明地动仪
C.《九章算术》的编写
D.《伤寒杂病论》的编写
答案:A
劳动者权利的维护的内容、原因与做法。
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简述酶活性调控的几种机制。