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【单选题】
I型呼衰吸氧浓度建议?A.
高浓度（＞65%）
B.
高浓度（＞35%）
C.
中高浓度（＞25%）
D.
低浓度（<35%）
E.
低浓度（<20%）
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举一反三
【多选题】Which three statements are true about the application of QoS models？ （）
A.
The DiffServ model requires applications to signal the network with QoS requirements.
B.
The DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses.
C.
The DiffServ model requires RSVP.
D.
The best effort model is suitable for applications such as file transfer and e-mail
E.
The IntServ model requires applications to signal the network with QoS requirements.
F.
The IntServ model attempts to deliver a level of service based on the QoS specified by each packet
【判断题】Letter of authorization (授权证书) of mail transfer can be circulated and transferred by endorsement.
A.
正确
B.
错误
【简答题】法国画家保罗、高更的一系列不朽作品都完成于?
【多选题】Which three statements are true about the appliance of QoS models？（）
A.
the DiffServ model requires applications to signal the network with QoS requirements
B.
the DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses
C.
the DiffServ model requires RSVP
D.
the best effort model is suitable for applications such as file transfer and e-mail
E.
the IntServ model requires applications to signal the network with QoS requirements
F.
the IntServ model model attempts to deliver a level of service based on the QoS specified by each packet
【判断题】Mail transfer can be replaced in the time of telecommunication developed rapidly.( )
A.
正确
B.
错误
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