标准体积管的标准体积，是体积管两个（）之间所置换的标定体积 ["检测点","检测开关","控制阀","变送器"]
根据《建设工程安全生产管理条例》，建设单位将保证安全施工的措施报送建设行政主管部门或者其他有关部门备案的时间是（）。 ["建设工程开工之日起15日内","建设工程开工之日起30日内","开工报告批准之日起15日内","开工报告批准之日起30日内"]
护理领导者的道德素质在护理管理中的作用是（）。 ["激励作用","教育作用","示范作用","鼓舞作用"]
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"]
社会工作含义？
