We need to respect other people in the______.(society/social)
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His parents went out last night, so he was______at home. (lonely /alone)
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
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