题目内容

具有J链结构的Ig是()

A. 单体IgA
B. IgIgE
C. IgIgD
D. SIgIgM
E. IgIgE

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颌面部损伤时诊断颌骨骨折的主要体征是（）和（）

Which two of these are characteristics of MPLS VPNs？（）

A. Layer 3 MPLS VPNs can forward only IP packets
B. Layer 2 MPLS VPNs can forward any network protocol
C. MPL S label paths are automatically formed based on Layer 2 frames
D. Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 frames
E. In Layer 2 MPLS VPNS， the service provider controls the customer Layer 3 policie

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