WCDMAFDD信号调制方式是上行采用QPSK,下行采用BPSK。
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In a switched environment, what does the IEEE 802.1Q standard describe?()
A. the operation of VTP
B. a method of VLAN trunking
C. an approach to wireless LAN communication
D. the process for root bridge selection
E. VLAN pruning vla
工业厂房地面的组成与民用建筑不同,也是由面层和地基组成。()
A. 正确
B. 错误
HRB335级钢筋的最大冷拉率为()%。
A. 10
B. 5.5
C. 20
D. 4.5