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为什么抗菌药物相对有选择地作用于病原微生物而不或较小影响机体?

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简述喹诺酮类的抗菌作用机制及细菌对其耐药性产生的机制。

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肿瘤化学治疗中存在的主要问题有哪些？

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What are the recent new ways of eating that can reduce the risk of Novel Corona Virus infections in Chinese people?

A. individual plating
B. use of communal chopsticks
C. use of individual utensils
D. having communal dining
E. sharing food with personal chopsticks

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Adham Sayed, a Lebanese PhD student, chronicles Wuhan citizens’ life at the outbreak of COVID-19 in his book "Confidence Comes from Effectiveness: A Foreigner’s Wuhan Diary" . He remained in Wuhan during the city's lockdown and did things like:

A. writing about his experiences online
B. answering questions from people around the world
C. broadcasting livestreamed videos
D. giving interviews to various media
E. working with the people of Wuhan

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