题目内容

His parents went out last night, so he was______at home. (lonely /alone)

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Paul was feeling a bit_____then, for he had nofriends. (lonely /alone)

Match thewords to their definitions.将单词和它们的意思连起来。

2.4GHz频段各信道中心频率之间的距离为多大（）？

A. 20MHz
B. 22MHz
C. 5MHz
D. 10MHz

802.11b协议中哪些信道是相互不重叠的（）？(选3项)

A. 1
B. 3
C. 6
D. 11