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VOIP is being implemented in the network and you need to assess the need for QoS. Which of thefollowing network problems would indicate a need to implement QoS features？（） ["Mis-routed packets","Excess jitter","Delay of critical traffic","Packet loss due to congestion","Data link layer broadcast storms","FTP connections unsuccessful"]
18个月的婴儿能搭积木6～7块，逐页翻书，用蜡笔乱涂。
医疗器械生产企业、经营企业和使用单位发现或者知悉可疑医疗器械不良事件应当填写《可疑医疗器械不良事件报告表》（附表一），严重伤害事件于发现之日起（）个工作日内、死亡事件于发现之日起（）个工作日内向所在省、自治区、直辖市医疗器械不良事件监测技术机构报告。
如果要在网页中插入插件，最常用的操作应（）进行设置。 ["点击标志1","点击标志2","点击标志3","点击标志4"]
简述离子吸附型稀土矿床的成因？
