For delay sensitive traffic， what are the three best ways that are used to prevent packet loss？ （） [" Compress payload."," Use header compression."," Increase link capacity."," Use random early detection."," Guarantee bandwidth to fragile flows."," Implement network-based application recognition."]
单位句可分为两大类，即（）和（）。
若所加预应拉力为导线破坏应力的（）%时，瞬间可将初伸长拉出。 ["50","60","70","80"]
Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （） [" Packets can arrive out of order."," Packets must take the same path to the destination."," Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic."," Packets can experience varying delays across the network."," Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path."]
论述社会保险与商业保险的区别。
引起发电机振荡的原因有哪些？
