You need to call an unmanaged function from your managed code by using platform invoke services. What should you do？（）
A. Create a class to hold DLL functions and then create prototype methods by using managed code.
B. Register your assembly by using COM and then reference your managed code from COM
C. Export a type library for your managed code.
D. Import a type library as an assembly and then create instances of COM object.
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SoftX3000对话单池剩余空间设置了二级门限，当话单池剩余空间到达一级门限（）时，产生告警；当达到二级门限（100％）时，则限呼并产生告警。
A. 60%
B. 70%
C. 80%
D. 90%
You work as a network technician. Your boss is interested in the QoS technology in the context ofvideo traffic. What can be said of application of this technology in this type of network？（）
A. The access layer is the initial point at which traffic enters the network. Traffic is marked （orremarked） at Layers 2 and 3 by the access switch as it enters the network， or is "trusted" that it isentering the network with the appropriate tag
B. No traffic marking occurs at the core layer. Layer 2/3 QoS tags are trusted from distributionlayer switches and used to prioritize and queue the traffic as it traverses the core
C. Traffic inbound from the access layer to the distribution layer can be trusted or reset dependingupon the ability of the access layer switches. Priority access into the core is provided based onLayer 3 QoS tags
D. IP precedence， DSCP， QoS group， IP address， and ingress interface are Layer 2 characteristics that are set by the access layer as it passes traffic to the distribution layer. Thedistribution layer， once it has made a switching decision to the core layer， strips these off
E. MAC address， Multiprotocol Label Switching （MPLS）； the ATM cell loss priority （CLP） bit， theFrame Relay discard eligible （DE） bit， and ingress interface are established by the voicesubmodule （distribution layer） as traffic passes to the core layer
F. The distribution layer inspects a frame to see if it has exceeded a predefined rate of trafficwithin a certain time frame， which is typically a fixed number internal to the switch. If a frame isdetermined to be in excess of the predefined rate limit， the CoS value can be marked up in a waythat results in the packet being dropped
可直接观察到病毒体大小的方法（）
A. 电镜观察法
B. 光镜观察法
C. X线衍射法
D. 超速离心法
E. 超过滤法
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