Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?（） [" optical technology for transmitting up to 32 channels over multiple fiber strands"," optical technology for transmitting up to 16 channels over multiple fiber strands"," a WDM system that is compatible with EDFA technology"," a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM ."]
定时限过电流保护的缺点是故障点离电源越近保护装置的动作时间越（）。 ["短","长","可靠","稳定"]
采用备抵法核算坏账损失的优点是（）。 ["符合谨慎性原则","避免虚增资产","为报表使用者提供更相关、可靠信息","加速资金周转","符合配比原则"]
PFl融资方式的主要特点是（）。 ["适用于公益性项目","适用于私营企业出资的项目","项目的控制权由私营企业掌握","项目的设计风险由政府承担"]
Which three components are part of the Intelligent Network Services provided by the Cisco AVVIDframework？ （） [" IP telephony"," security"," IP multicasting"," QoS"]
教育法的实施，是指教育法律规范在现实生活中的（）
