皮皮学，免费搜题
登录
搜题
【多选题】
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【图片】。已知信道中信号功率损失为50dB,信道噪声为带限噪声，其双边功率谱密度为【图片】，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和平均发送功率分别是（ ）。A.
30KHz
B.
15KHz
C.
300W
D.
900W
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【判断题】考生如有携带与考试内容相关的材料或者存储有与考试内容相关资料的电子设备参加考试的;抄袭或者协助他人抄袭试题答案或者与考试内容相关的资料的;抢夺、窃取他人试卷、答卷或者胁迫他人为自己抄袭提供方便的;携带具有发送或者接收信息功能的设备的等行为的,认定为考试作弊,其所报名参加考试的各阶段、各科成绩无效。
A.
正确
B.
错误
【单选题】Because of the rain, the headmaster suggested that the sports meeting ______ until next week.
A.
should put off
B.
would be put off
C.
would put off
D.
be put off
【单选题】The sports meeting next month.
A.
will hold
B.
is going to hold
C.
will be held
D.
will be hold
【简答题】The president made a ________ speech at the opening ceremony of the sports meeting, which encouraged the sportsmen greatly. A) vigorous B) tedious C) flat D) harsh
【单选题】The boys by the coach now will take part in the sports meeting of the school next month．
A.
chosen
B.
being chosen
C.
choosing
D.
to be chosen
【单选题】May I ask you a question?（）
A.
Yes. you need
B.
Yes. ask
C.
Yes. please
D.
Let me see
相关题目：
【单选题】The sports meeting next month.
A.
will hold
B.
is going to hold
C.
will be held
D.
will be hold