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【多选题】
中国领土面积为960万平方公里,在世界上仅次于( )A.
加拿大
B.
俄罗斯
C.
美国
D.
印度
E.
巴西
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举一反三
【多选题】Which two statements are true about og to digital conversion of voice signals for use in digital telephony networks？ （）
A.
The three required steps in the og to digital conversion are sampling， encoding， and compression.
B.
The three required steps in the og to digital conversion are sampling， quantization， and compression.
C.
The three required steps in the og to digital conversion are sampling， quantization， and encoding.
D.
The output of the sampling process is a pulse code modulation （PCM） signal.
E.
The output of the sampling process is a pulse amplitude modulation （PAM） signal.
【单选题】________ or voice-input devices accept spoken words through a microphone and change the sounds into computer readable signals.
A.
Speech-recognition
B.
Sensor
C.
Sanner
D.
Printer
【单选题】— Why do you drink so much tea? — Well, _____ it doesn't keep me awake in the nights. [ ]
A.
although
B.
as soon as
C.
as long as
D.
while
【判断题】Sweating, twitches of muscles, and changes in voice tone are signals of anxiety.
A.
正确
B.
错误
【简答题】What is the emission designation for MF/HF voice signals?A. FIB. B. J3E. C. J2B. D. F3E.
【单选题】Distress signals may be（）.
A.
red flares
B.
smoke signals
C.
sound signals
D.
Any of the above
【单选题】Why do the middle-aged people prefer tea according to the author?
A.
They become practical and want to save money.
B.
They like the faint and lingering fragrance of the Chinese tea.
C.
Coffee is too bitter for them to drink.
D.
Hot tea is good for their health.
【单选题】The telephone contains a transmitter and receiver for converting back and forth og voice and og electrical signals.
A.
in
B.
between
C.
to
D.
into
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