国语
Which two of these are characteristics of multicast routing？ （） [" multicast routing uses RPF"," multicast routing is connectionless."," In multicast routing， the source of a packet is known."," When network topologies change， multicast distribution trees are not rebuilt， but use the originalpath"," Multicast routing is much like unicast routing， with the only difference being that it has a a groupof receivers rather than just one destinatio"]
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由人身保险业务本身的长期性所产生的特点包括（） ["可用于投资的资金不多","保单调整的难度小","业务管理上的连续性","保单具有投资收益"]
患儿，男，9个月，咳嗽2天，1天来发烧38℃～38.5℃，伴喘憋而人院。病后吃奶稍差，二便正常。查体：急性病容，呼吸急促，T：38.5℃，R：50次／分，P：160次／分，可见鼻扇及 三凹征，口周发绀，两肺满布中小水泡音及痰鸣音，腹软，肝肋下lcm，余正常，神经系统正常。化验：Hb：112g/L，WBC：21×109/L。列出主要护理问题。
试述手动准同期并列操作程序
