【名词&注释】
自然灾害(natural disaster)、人员培训(personnel training)、系统安全管理(system safety management)、物理攻击、管理站
[多选题]不属于物理安全威胁的是()
A. 自然灾害
B. 物理攻击
C. 硬件故障
D. 系统安全管理人员培训不够
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举一反三：
[单选题]When most people refer to multimedia, they generally mean the combination of two or more continuous media, usually with some user(115). In practice, the two media are normally audio and video, this is,(116)plus moving(117).It should be' obvious by now that transmitting multimedia material in uncompressed form. is completely out of(118). The only hope is that massive compression is possible. Fortunately, a large body of research over the past few decades has led to many compression techniques and algorithms that make multimedia transmission(119).
A. display
B. games
C. help
D. interaction
E. pictures
[单选题]阅读以下说明和关系表，回答问题1～3。[说明]
A. 已知关系R(A，B，
B. C，
C. 和函数依赖集
D. F为{AB—＞
E. D，
F. C—＞，A，
G. D—＞
H. C}。
I. 找出关系R的候选键，一共有几个?
[单选题]在SNMPv2协议中共有6种协议数据单元(PDU)，某台管理站可以利用(47)PDU将有关的管理信息告诉另一台管理站。
A. SetRequest
B. GetBulkRequest
C. GetNextRequest
D. 1nformRequest
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