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【单选题】
What are three advantages of VLANs? (Choose three.)A.
AN的三大优势是什么？（选择三项）
B.
They establish broadcast domains in switched networks.
C.
AN在交换网络中创建广播域。
D.
They utilize packet filtering to enhance network security.
E.
AN利用数据包过滤技术来增强网络安全性
F.
They provide a method of conserving IP addresses in large networks.
G.
AN提供了在大型网络中的保护IP地址的方法
H.
They provide a low-latency internetworking alternative to routed networks.
I.
LN提供低延迟互联网络替代网络。
J.
They allow access to network services based on department, not physical location. K. an允许基于逻辑划分（而不是物理位置）的网络访问。 L. They can simplify adding, moving, or changing hosts on the network.
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【简答题】聚丙烯的立体异构包括 、 和无规立构。
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A.
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