PTN设备支持的伪线业务包括有（） ["TDME1","IMAE1","ATM","Ethernet"]
CPC30型叉车变速器采用的是（）齿轮机械换挡变速器。 ["锥形","直条","滑动","斜"]
How does a DHCP server dynamically assign IP addresses to hosts?（） ["Addresses are permanently assigned so that the host uses the same address at all times.","Addresses are assigned for a fixed period of time. At the end of the period, a new request for an address must be made, and another address is then assigned.","Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.","Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement."]
Which multicast address is reserved for cisco-rp-discovery？（） ["224.0.1.37","224.0.1.38","224.0.1.39","224.0.1.40"]
简述应如何进行采购计划执行的监控？
必修课程的本质特点就是（），它是社会权威在课程中的体现。选修课程一般分为必选课程与任选课程两类。
