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【多选题】
下列关于SPF计算最短路径树说法正确的是()
A.
SPF计算最短路径树的第一根据Router-LSA和Network-LSA中的拓扑信息,构建SPF树干
B.
SPF计算最短路径树的第二基于SPF树干和Router-LSA、Network- LSA中的路由信息,计算最优路由
C.
OSPF网络中OSPF路由器将分别以自身为根节点计算最短路径树
D.
经过OSPF优选后的路由一定会安放进系统路由表
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别有悠愁暗恨生，此时无声胜有声。
B.
别有忧愁暗恨生，此时无声胜有声。
C.
别有幽愁暗恨生，此时无声胜有声。
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【单选题】I wondered__.
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B.
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A.
别有悠愁暗恨生，此时无声胜有声。
B.
别有忧愁暗恨生，此时无声胜有声。
C.
别有幽愁暗恨生，此时无声胜有声。
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缺失时间过长，舌体变大
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垂直距离过高
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后牙覆盖过小
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上颌结节与磨牙后垫部位的基托间间隙过小
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