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【单选题】
设某信道具有均匀的双边噪声功率谱密度Pn(f)=0.5*10 -3 W/Hz,采用DSB方式调制,基带信号最大频率为5KHz,已调信号功率为10kW,求相干解调时解调器的调制制度增益为A.
1
B.
2
C.
3
D.
4
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于尖锐湿疣病理改变的描述错误的是
A.
角质层角化不全
B.
乳头瘤样增生
C.
表皮嵴增粗延长
D.
表皮中上层细胞有明显的空泡形成，这些空泡细胞比正常细胞稍小
E.
真皮血管周围炎症细胞浸润
【简答题】A．25×10-5 B．33×10-5 C．66×10-5 D．75×10-5
【简答题】为了抑制二次反应,工业上采取了 和 两种措施。
【单选题】[5-11]Indetermining a safe speed ___shall not be among those taken into account.
A.
the presence of the background light at night
B.
the state of wind, sea and current
C.
the number of crew on board
D.
the draught in relation to the available d
【单选题】The book you bought is more expensive than _______.
A.
that
B.
my own one
C.
that one
D.
my one
【单选题】The book inevitably _______ my own interests and experiences.
A.
mirrors
B.
realizes
C.
discusses
D.
chooses
【简答题】Despite the fact that I have tried to be , the book is still a bit subjective, as it reflects my own interests and experiences.
相关题目：
【单选题】The book you bought is more expensive than _______.
A.
that
B.
my own one
C.
that one
D.
my one