试说明发达国家的公共事业组织的监督机制框架和发展趋势。
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Which two statements are true about voice VLANs？（）
A. Voice VLANs are only used when connecting an IP phone and a host to distinct switch ports
B. Access ports that are configured with voice VLANs will always trust the CoS that is received from IP phones
C. Access ports that are configured with voice VLANs may or may not override the CoS value that is received from an IP phone
D. Voice VLANs are configured using the switchport voice vlan vlan-ID interface configuration command
E. Voice VLANs provide a trunking interface between an IP phone and an access port on a switch to allow traffic from multiple devices that are connected to the port
F. Enabling Voice VLAN on a switch port will automatically configure the port to trust the incoming CoS marking
流感的特点是全身中毒症状较轻，发热与上呼吸道症状较重。
A. 正确
B. 错误
“和平统一、一国两制”对台方针政策提出的时代背景是什么？。
植物叶片是担负着植物最重要的生理功能――光合作用的主要器官。
A. 正确
B. 错误
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