票据的无因性是指在同一票据上有多种票据行为存在时，各种票据行为依据各自在票据上所记载的文义内容，独立发生效力，一种行为的无效，不影响其他行为的效力。
在环境水利中，水体与水有何不同？
某人投资四种股票，投资状况见下表，则其所投资的股票组合的年预期收益率为（）。 ["0.13","0.15","0.17","0.19"]
Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on all interfaces in the network to support a new video streaming application. No other multicast configuration was applied anywhere in the network. Since enabling multicast， the network monitoring tools show periodic spikes in link utilization throughout the network， even in areas where the video application is not being used. What could be a possible cause？（） ["PIM sparse mode is being used.","PIM dense mode is being used.","The BGP multicast address family has not been configured.","IGMP version 3 is being used.","IP PIM neighbor filters have not been applied."]
重要焊缝是指直接涉及到人身安全的焊缝，如（） ["乘坐物支撑件焊缝、升降油缸（气缸）上下支撑件焊缝","乘坐物吊挂点支撑件焊缝","轨道对接焊缝","车辆连接器焊缝、吊厢框架焊缝等"]
风险被定义为？
