LTE系统中,相对于16AM,应用69QAM的优点有是那个?()
A.提升了频谱利用率
B.提升了抗噪声,抗衰扰性能
C.降低系统误码率
D.实现更简单
参考答案:A
_____、畜牧业、_______和商业的繁荣,形成了我国夏商西周灿烂的__________文明。
-Do you often play computer games after school?
-Yes. We often play a game __________ "super mario(超级马力)".[ ]
A. call
B. calls
C. called