【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.
【单选题】— Why do you drink so much tea? — Well, _____ it doesn't keep me awake in the nights. [ ]
【单选题】ZD115型电机电枢共有( ),其换向片节距为124。
【单选题】边坡病害体治理稳定性分析标准中,等级为II的边坡,发生整体失稳的概率为()
【判断题】希腊神话中,凡人死后必须经过忘川河,才算进入冥界。
【单选题】Distress signals may be().
【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】Christmas is traditionally an important religious festival in many Western countries, but it’s also celebrated in China. Why do you celebrate Christmas?
A.
Because it’s an opportunity to go shopping and join in an international celebration.
B.
Out of respect for other people’s religions and religious festivals.
C.
Due to its religious importance to me.
D.
Because my friends and classmates all celebrate Christmas.
【单选题】Why is the tea set important?
A.
A good tea set can reflect the color, aroma and taste of tea.
B.
While enjoying tea, it is also helpful to appreciate the fine tea set.
C.
Tea sets are the father of tea.