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单选题
On an Aironet card， LED 0 and LED 1 are blinking alternately. What does this indicate？ （）
A
The Aironet card is in power save mode.
B
The Aironet card is looking for a network association.
C
The Aironet card is joined to a network， but there is no network activity.
D
The Aironet card is joined to a network， and there is network activity.
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