从生产的纵向链条上讲，菜油也是生产铅笔这种最终产品的其中一项原料，因为生产橡皮的橡胶状材料需要菜油作为原料。因此有人说：“铅笔厂应该拥有自己的菜油供给来源，以免受短期供需失控的影响”。请分析此话的错误。
查看答案
During the IPv6 autoconfiguration, what does the device append to the 64- bit prefix that it receives from the router to create its IPv6 address?（）
A. a pseudora ndom generated number
B. its locally configured IPv4 address
C. the DHCP - supplied device ID
D. its MAC addre
微信支付 
支付宝支付