写出下列英文缩写的中文名称:LAN:WAN:TCP/IP:HUB:SWITCH:
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G.653光纤是指色散平坦型单模光纤。
A. 正确
B. 错误
钢轨联结零件就是指接头连接零件。
A. 正确
B. 错误
A vessel engaged in fishing,and at anchor,shall show().
A. an anchor light
B. sidelights and a stern light
C. three lights in a vertical line,the highest and lowest being red,and the middle being white
D. None of the above