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【单选题】
以下关于PCM编码方法的描述中,错误的是A.
PCM技术的典型应用是语音数字化
B.
PCM工作包括采样、量化与编码
C.
取样频率f应取信道允许通过的信号最高频率的2倍
D.
PCM用7位二进制数，采样速率为8000样本/秒，数据速率为64kbps
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【判断题】监控系统包括视频监控、火灾监控、气体泄漏监控等设备。对于特殊仪器设备可能使用的危险气体,可安装例如氢气、一氧化碳等可燃气体的探头,并具备报警功能。
A.
正确
B.
错误
【简答题】A．To talk with someone or with oneself. B．To have a long and good relaxation. C．To do more aerobic exercises. D．To take more anti-anxiety drugs.
【单选题】听力原文：M: How are you today? W: I am fine, thank you. Q: How is she? (20)
A.
She is fine.
B.
He is fine.
C.
He is ill.
【单选题】--- The price is fine with me. How would you like ____ paid? --- Well, it’s up to you.
A.
this
B.
that
C.
it
D.
one
【简答题】A．To talk with someone or with oneself. B．To have a long and good relaxation. C．To do more aerobic exercises. D．To take more anti-anxiety drugs.
【单选题】That would be a good way to keep both teachers and students ______. [ ]
A.
happily
B.
more happier
C.
more happy
D.
happier
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