单项选择题

鼠疫、霍乱等传染病应采取哪种隔离方式()

A.严密隔离
B.呼吸道隔离
C.肠道隔离
D.接触隔离
E.保护性隔离

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In this part, you are required to write a composition entitled Duality of Science: Its Positive Effects and Side Effects in no less than 200 words. Your composition should be based on the following outline:1. The positive effect of science.2. The side effects of science.3. Make the best use of the positive effects of science and avoid its side effects.
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效用最大化的条件是()
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