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【单选题】
Which statement is correct about an OSPF sham-link？（）A.
A sham-link is a logical link between PE routers that provides an OSPF adjacency between the PE routers and forwards customer traffic across it.
B.
A sham-link is a logical link between PE routers that provides an OSPF adjacency between the PE routers and carries OSPF LSAs.
C.
A sham-link is a logical link between PE routers that carries OSPF LSAs and forwards customer traffic across it.
D.
A sham-link is a point-to-multipoint link that provides an OSPF adjacency between the PE routers and carries OSPF LSAs.
E.
A sham-link is a point-to-multipoint link that provides an OSPF adjacency between the PE routers and forwards customer traffic across it.
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反馈参考答案：
举一反三
【单选题】等温一级不可逆液相反应，采用下列三种方案进行： （1）一个分批式完全混合反应器，容积V1（仅考虑反应时间所需） （2）一个平推流反应器，容积V2 （3）二个等体积全混流反应器串联，总容积为V3 上述三种情况反应温度、物料处理量及转化率相同，则容积比较为（）.
A.
V1
B.
V1=V2
C.
V2
参考解析：
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