WiFi遵循的协议标准是 _________，其数据链路层采用_________协议来解决冲突问题。
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RFID的标签根据其是否有内置电源，可分为_________、_________和半主动式标签三中类型。
_______ is the first published collection of poems by Robert Frost.
A. Mountain Interval
B. A Boy's Will
C. North of Boston
D. The Road Not Taken
_________ is a prominent leader for " Harlem Renaissance" in 1920s America.
A. Ezra Pound
B. Robert Frost
C. Langston Hughes
D. Archibald MacLeish
The famous line " A poem should not mean/But be" comes from______________.
A. "Dreams" by Langston Hughes
B. "Me and the Mule" by Ezra Pound
C. "The Road Not Taken" by Robert Frost
D. "Ars Poetica" by Archibald MacLeish.
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