[多选] Which three of these statements about PPPoE are true？（）

A . PPPoE can provide a host with access to a destination over Ethernet. You can have only one PPPoE session per PVC
B . You must install PPPoE client software on all hosts that connect to the Ethernet segment. This means that the access provider must maintain a CPE
C . You cannot use PPPoE with Cisco Service Selection Gateway
D . PPPoE implementation is susceptible to broadcast storms and possible denial-of-service attacks
E . Per-session accounting is possible， which allows the service provider to charge the subscriber based on session time for various services offered. The service provider can also require a minimum access charge

属于一级预防范畴的是（）早发现。提供假肢。预防接种。就业指导。功能训练。对于恒转矩负载，为什么调压调速的调速范围不大？电机机械特性越软调速范围越大吗？ What is the most common cause of network congestion？（） aggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core-layer switches。 speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environment。 flapping Ethernet interfaces caused by misconfigured LAN interfaces。 flapping serial interfaces caused by misconfigured WAN interfaces。 speed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment。刚性好变形小的电器绝缘件，应使用（） ABS。酚醛塑料。聚丙烯。聚碳酸酯。关于《中华人民共和国宪法》（1954年），下列说法正确的是（）。 A.结束了帝国主义、封建主义、官僚资本主义在中国的统治。 B.保障了在政治上从新民主主义社会向社会主义社会的过渡。 C.进入了有法可依、依法治国、建设法制化社会的新时期。 D.确立了民主选举、决策、管理及监督的基层民主制度。 Which three of these statements about PPPoE are true？（）

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[多选] Which three of these statements about PPPoE are true？（）

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