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【多选题】
对检定、校准证书的审核是保证工作质量的一个重要环节,核验人员对证书的审核内容包括( )A.
对照原始记录检查证书上的信息是否与原始记录一致
B.
对数据的计算或换算进行验算并检查结论是否正确
C.
检查被测件的功能是否正常
D.
检查数据的有效数字和计算单位是否正确
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【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.
【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
【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 analog voice and analog electrical signals.
A.
in
B.
between
C.
to
D.
into
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