【单选题】is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.(52)is a professional organization of individuals in ...
【单选题】听力原文: Sydney is situated on the foreshores of one of the most magnificent harbors in the world. It was founded in 1788 and with a population of over 3 million. It is the largest city in Australia. Aut...