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单选题
Which IEEE standard is used to define Wi-Fi?（）
A
IEEE 802.3
B
IEEE 802.5
C
IEEE 802.11h
D
IEEE 802.11c
E
IEEE 802.11
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单选题Which spread spectrum technology does the 802.11b standard define for operation（）。A
IRB
DSSSC
FHSSD
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IR, FHSS, and DSSS
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