问题
单项选择题
用单模光纤做媒体的1000BaseLX以太网，在全双工条件下，网段距离最大可达 (42) 。
A．100m
B．2000m
C．3000m
D．40000m
答案
参考答案：C
解析：[要点解析] 用单模光纤做媒体的1000BaseLX以太网，在全双工条件下，网段距离最大可达 3000m。
搜题请搜索小程序“爱下问搜题”
用单模光纤做媒体的1000BaseLX以太网，在全双工条件下，网段距离最大可达 (42) 。
A．100m
B．2000m
C．3000m
D．40000m
参考答案：C
解析：[要点解析] 用单模光纤做媒体的1000BaseLX以太网，在全双工条件下，网段距离最大可达 3000m。
根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有两项多余选项。（共5小题：每小题2分，满分10分） ----Hello, Susan, why are you so late for work today? ----- 小题1: A man came up to me and pulled out a knife. He pointed it right at me. ----- 小题2: ---- I grabbed his knife, but he pushed me to the floor, took my handbag and ran away. ---- 小题3: That’s so dangerous. -- -I don’t know. I just didn’t think at the time. ---- 小题4: ---- They tried to help. Two men ran after the robber and caught him. The conductor called the police and the robber was taken to the police station. ---- 小题5: ---- I will. Thank you.
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