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in, to to, by to, in in, in
hear heard had heard have heard
UPE主要完成用户接入功能 通过分层式PE的嵌套，理论上可以将VPN无限扩展与延伸。 SPE的路由表容量大，转发性能强，接口资源较多； UPE的路由容量和转发性能较低，但接入能力强。HoVPN充分利用了SPE的性能和UPE的接入能力 SPE-UPE，SPE和UPE之间运行MP-BGP，可以是MP-IBGP，也可以是MP-EBGP，这取决于UPE和SPE是否属于同一个AS。PTN网络规划一般采取MP-IBGP。 SPE主要完成VPN路由的管理和发布
How a pleasant surprise How pleasant surprise What a pleasant surprise What pleasant surprise
in; to to; by to; in in; in
surprised to surprise surprising surprise
SPE是一个柱色谱分离过程 SPME是在SPE的基础上结合顶空分析技术的一种萃取分离技术 SPE操作步骤包括柱预处理、加样和回收分析物三个步骤 SPE过程中柱预处理可以除去填料中的杂质和润湿吸附剂
cold cool original surprise
surprised to surprise surprising surprise
surprised surprise is surprised is surprising
to, with for, in for, with by, at
surprising surprise surprised surprises
about , surprise about , surprised on , surprise of , surprised
for, to by, for up, over at, in
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