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【单选题】
交换机主要工作在 OSI 模型的( )。A.
物理层
B.
数据链路层
C.
网络层
D.
传输层
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【单选题】May we please have your attention for the safety demonstration? If you have any questions after ____________, please contact the flight attendants. Thank you!
A.
the safety video
B.
video system
C.
amusement
D.
demonstration
【单选题】_____ being prepared for the flight, the crew also ensure that all passengers know safety matters.
A.
Beside
B.
Not only
C.
As well as
D.
In addition
【单选题】The PIC is the person legally ________ the aircraft and its flight safety and operation and would normally be the primary person liable for a violation of any flight rule.
A.
in case of
B.
in the of
C.
in charge of
D.
in the charge of
【单选题】我国信息安全面临的威胁有( ) 1主要技术依赖进口,信息产业受制于人 2信息安全的防护能力较弱 3信息安全管理机构尚不完善 4信息安全意识亟待提高 5信息传播速度急剧加快
A.
①②③④⑤
B.
①②③④
C.
①②③⑤
D.
②③④⑤
【单选题】Pilots train on flight simulators for safety, learning efficiency, and cost savings. This is an example of ________.
A.
apprenticeship training
B.
on-the-job training
C.
vestibule training ( 技工培训 )
D.
programmed learning
【简答题】信息安全面临的主要威胁有哪些?
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