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【判断题】
党的十九大明确指出,中国特色社会主义进入新时代,我国社会主要矛盾已经转化为人们日益增长的美好生活需要和不平不充分的发展之间的矛盾。A.
正确
B.
错误
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举一反三
【多选题】Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks？ （）
A.
The three required steps in the analog to digital conversion are sampling， encoding， and compression.
B.
The three required steps in the analog to digital conversion are sampling， quantization， and compression.
C.
The three required steps in the analog 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.
【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.
【简答题】Telephone-quality og voice signals
【单选题】The telephone contains a transmitter and receiver for converting back and forth analog voice and analog electrical signals.
A.
in
B.
between
C.
to
D.
into
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