单项选择题

使用碘对比剂主要不良反应中最常见的是（）
A、过敏样反应
B、对比剂相关的急性肾损伤
C、对比剂外渗
D、对比剂肾病

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对粗产物进行提纯，得到质量合格产物的过程称为产物的过程。

答案：纯化

单项选择题

Choose the best paraphrasing for each of the following sentences: The war acted merely as a catalytic agent in this breakdown of the Victorian social structure.

A．The war speeded up the collapse of the Victorian social structure.
B．This breakdown of the Victorian social structure resulted in the war.
C．The war was just an element in this breakdown of the Victorian social structure.
D．This breakdown of the Victorian social structure actually stopped the war.