Which two are differences between IGMPv2 and IGMPv3 reports？（） ["IGMPv3 has the ability to include or exclude source lists.","All IGMPv3 hosts send reports to destination address 224.0.0.22.","Only IGMPv2 reports may contain multiple group state records.","All IGMPv3 hosts send reports to destination address 224.0.0.23.","IGMPv2 does not support the Leave Group message."]
以下关于PTN支持的业务描述正确的是（） ["目前PTN支持多个ATM连接汇聚映射到一个PW中","目前PTN不支持多个CES业务汇聚映射到一个PW中","PTN设备间可以建立ATMPW来仿真端到端的ATM业务","目前PTN支持多个以太业务汇聚映射到一个PW中"]
通货膨胀
遇有特殊情况，经（）同意，（）可批准旅客列车在不停车站临时停车。 ["铁路总公司","铁路局领导","客运主管部门","客调"]
变速器的功用是（）驱动轮转矩和转速的范围，以适应经常变化的行驶条件。 ["减小","扩大","不变","相等"]
逻辑设计法
