题目内容

255.255.255.255地址称为

A. 有限广播地址
B. 定向广播地址
C. 组播地址
D. 保留地址

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有类地址IP地址128.40.21.30的哪一部分表示网络号？

A. 128.40
B. 128
C. 128.40.21
D. 30

What are the most fatal pandemic in recorded history?

A. smallpox
Black Death
C. the 1918 influenza pandemic
D. COVID-19

The World Health Organization (WHO) previously applied a _____stage classification to describe the process by which a novel influenza virus moves from the first few infections in humans through to a pandemic.

A. 4
B. 6
C. 7
D. 5

What are the basic strategies in the control of an outbreak?

A. contact tracing
B. isolation
C. mitigation
D. vaccination