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【简答题】
假设音频信号x(t)经调制后在高频信道传输。要求接收机输出信噪比S0/N0=50dB。已知信道中信号功率损失为50dB,信道噪声为带限高斯白噪声,其双边功率谱密度为n,音频信号x(t)的最高频率【图片】,并且有【图片】,则:100%的振幅调制时,接收端采用非相干解调,已调信号的传输带宽=()KHz
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【单选题】当代开发票时,操作员保存数据后,不小心关闭了开票窗口而未开具发票,应如何处理()
A.
重新录入发票信息,再进行开票
B.
再次录入同一个微机编码将继续在待开具发票明细窗口显示未开具的发票信息
C.
再次录入任一微机编码将继续在待开具发票明细窗口显示未开具的发票信息
D.
所有选项的操作都可以
【单选题】He has thrown away his old shoes.He’ll have to buy ___.
A.
a new one
B.
a new pair
C.
some new pair
D.
a new shoes
【简答题】A.He did not receive the New Student Packet. B.He did not read through the New Student Packet. C.The City Metro did not send an advertisement to him. D.He did not join the student union.
【单选题】如何关闭An/Droi/D数据开关?( )
A.
设置-应用程序-未知来源
B.
设置-账户与同步-背景数据
C.
设置-无线和网络-移动网络-已启用数据
D.
设置-位置和安全-移动数据
【单选题】Who is the young man?
A.
He is a new teacher.
B.
He is a new student.
C.
He is Mike.
【单选题】决定核外电子运动状态的量子数是
A.
n , l
B.
n , m
C.
n , l , m
D.
n , l , m , m s
【单选题】如何关闭Android数据开关?( )
A.
设置-应用程序-未知来源
B.
设置-账户与同步-背景数据
C.
设置-无线和网络-移动网络-已启用数据
D.
设置-位置和安全-移动数据
【单选题】决定核外电子运动状态的量子数是
A.
n
B.
n , l
C.
n , m , l
D.
n , l , m ,ms
【单选题】He didn't tell me _______. [     ]
A.
where he bought the new computer
B.
where did he buy the new computer
C.
where he buys the new computer
D.
where does he buy the new computer
【简答题】A.He got fired. B.He found a new job. C.He got a promotion. D.He got a new office.
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