单项选择题R1 forwards a packet from Host 1 to remote Server 1. Which statement describes the use of a MAC as the frame carrying this packet leaves the s0／0／0 interface of R1（）。
单项选择题测定杨氏模量常用的测量方法有拉伸法、梁微弯法和振动法等。本实验装置为梁微弯法。 A、正确 B、错误
