1350OMS中如果看到某网元边上有个绿色红绿灯的标志，则表明该网元（） ["正在配置业务","网元脱管","网元空闲","正在下载软件"]
《动车组列车服务质量规范》广告经营规范。广告发布的内容、形式、位置等符合有关规范，布局合理，安装牢固，内容健康，与列车环境协调，不挤占铁路图形标志、业务揭示、安全宣传等客运服务内容或位置，不影响安全和服务功能，不损伤车辆设备设施。
总硬度。
动力装置和车轮之间无（）联系，便于总体布置及维修。 ["硬度","强性","刚性","弹性"]
Which of these statements about PIM join messages in classic PIM-SM is correct？（） ["PIM join messages are sent every 60 seconds to refresh the upstream router’s mroute state for the multicast tree.","Routers send a PIM join acknowledgement in response to each PIM join message received from a downstream router.","PIM join messages are only sent when the multicast distribution tree is first being established.","PIM join messages are sent every three minutes to refresh the upstream router’s mroute state for the multicast tree."]
基因定点突变
