下载APP
【单选题】
高保真立体声音频信号的频率范围是:
A.
50～20000Hz
B.
200Hz～3400Hz
C.
50～7000Hz
D.
300Hz～3000Hz
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Dear Mr. Smith: Thank you very much for your inquiry dated December 12, 2002. I am glad to tell you that we are an outstanding hi-tech company specializing in telephone facilities and are able to of...
A.
telephone recorders
B.
exclusive products
C.
telephone facilities
D.
mobile telephones
【单选题】Task 2Directions: This task is the same as Task 1．The 5 questions or unfinished statements are numbered 41 through 45.Dear Mr．Smith: Thank you very much for your inquiry dated December 12, 2002．I am g...
A.
telephone recorders
B.
telephone facilities
C.
exclusive products
D.
mobile telephones
【单选题】人发声的频率范围大约为 [ ]
A.
20 HZ~1100 HZ
B.
85 HZ~20000 HZ
C.
85 HZ~1100 HZ
D.
20 HZ~20000 HZ
相关题目：
【单选题】低频 RFID 的频率范围是( )
A.
30~300kHz
B.
3~30MHz
C.
300MHz~3GHz
D.
3~30GHz
【单选题】Dear Mr. Smith: Thank you very much for your inquiry dated December 12, 2002. I am glad to tell you that we are an outstanding hi-tech company specializing in telephone facilities and are able to of...
A.
telephone recorders
B.
exclusive products
C.
telephone facilities
D.
mobile telephones
【单选题】CRH2型动车组收音机广播装置通过外部天线接收AM／FM信号，并输出()AM音频信号给自动广播装置。
A.
1路
B.
2路
C.
3路
D.
4路
【单选题】Ku频段的频率范围为（）GHz.
A.
12.4~18
B.
18~26.5
C.
26.5~40
D.
3.95~8.2
【单选题】增益调节旋钮GAIN( )音频信号到PEAK灯。
A.
遥控
B.
调制
C.
形成
D.
控制
【单选题】录像机音频信号电路中，当偏磁信号过大，则（）信号的记录灵敏度将迅速下降
A.
低中音频
B.
低音频
C.
中音频
D.
高音频
【单选题】TENS的物理频率范围是
A.
l~ll0Hz
B.
0~150Hz
C.
0~70Hz
D.
l~150Hz
【单选题】Bandn78支持的频率范围是()
A.
A.3.0–3.5GHz
B.
C.
C.3.2–3.7GHz
D.
D.3.3–3.8GHz
【单选题】人发声的频率范围大约为（ ）
A.
20HZ～1100HZ
B.
85HZ～20000HZ
C.
85HZ～1100HZ
D.
20HZ～20000HZ
【单选题】某信号的频率范围从40kHz到4MHz，则该信号的带宽为 ：
A.
36MHz 3.96MHz
B.
360kHz
C.
3.96MHz
D.
396MHz
【单选题】厘米波的频率范围为（）。
A.
3~30kHz
B.
30~300kHz
C.
3GHz~30GHz
D.
30GHz~300GHz
【单选题】Task 2Directions: This task is the same as Task 1．The 5 questions or unfinished statements are numbered 41 through 45.Dear Mr．Smith: Thank you very much for your inquiry dated December 12, 2002．I am g...
A.
telephone recorders
B.
telephone facilities
C.
exclusive products
D.
mobile telephones
【单选题】人发声的频率范围大约为 [ ]
A.
20 HZ~1100 HZ
B.
85 HZ~20000 HZ
C.
85 HZ~1100 HZ
D.
20 HZ~20000 HZ
【多选题】高保真原型包括:()、()、()。
A.
真实的原型
B.
现成的原型
C.
DIY原型
D.
手板
【单选题】中频设备的频率范围为（）RHz
A.
50-100
B.
30-80
C.
0.18-8
D.
0.05