伸出屋面管道根部四周应增设附加层，宽度和高度均不应小于（）。
A. 200mm
B. 250mm
C. 300mm
Which statement is true about the comparison of voice traffic with video traffic？（）
A. video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows
B. latency requirements are less stringent for video traffic than for voice traffic
C. video traffic is less sensitive to dropped packets than for voice traffic
D. video traffic requires the retransmission capabilities of TCP whereas voice uses UDP
E. video traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows
F. voice traffic requires the retransmission capabilities of TCP whereas video uses UDP
著名乌龙茶泡法中有一道程序“叶嘉酬宾”这句话中“叶嘉”是哪个大文豪对它的美称？
根据《YDT 5095-2005 SDH长途光缆传输系统工程设计规范》，DDF连接器接线端子尺寸与相关电缆尺寸无需匹配。
A. 正确
B. 错误
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