Refer to the exhibit. Which two conclusions can be drawn from the debug ip igmp output?（） [" The router sent an IGMP version 2 query out interface Ethernet1 at multicast address 224.0.0.1."," Router RTA received an IGMP report version 1 from host 192.168.9.1."," Reverse Path Forwarding (RPF) is ena bled for 192.168.9.4."," Reverse Path Forwarding (RPF) is enabled for 224.0.1.40."," The IP multicast groups are 224.0.0.1, 224.0.1.40, and 239.255.0.1."," IP PIM RP mapping is static."]
到期一次还本付息的方法适合（）。 ["期限1年以内（含1年）的贷款","期限5年以上（含5年）的贷款","预期未来收入呈递减趋势的借款人","自身财务规划能力较强的借款人"]
用于消防水、空调冷热水、给水、雨水等系统直径大于或等于100mm的镀锌钢管的是（）。 ["卡套式连接","沟槽连接","卡压连接","法兰连接"]
根据规定，钢丝绳直径减少量达（）时，应予报废。 ["7%","10%","40%"]
某企业一台设备的原价为40000元，预计残值为1000元，预计使用年限为5年。试分别用双倍余额递减法和年数总和法计算该设备在各年的折旧情况。
调速器的作用？
