On a Cisco Aironet 802.11 a/b/g wireless LAN client adapter，the status LED and activity LED are alternating on and off. What does this indicate？（）
A. The client card has failed.
B. The client card is not associated to the network.
C. The driver has been installed incorrectly.
D. The client card has awakened from power-save mode.
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A. ①②③
B. ①②④
C. ②③④
D. ①②③④
PAL制作的播放速率是（）
A. 每秒24帧
B. 每秒25帧
C. 每秒29帧
D. 每秒30帧
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