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问题 单项选择题

（）是指在污染源现场安装的适用于监控、监测污染物排放的仪器、流量（速）计、污染治理设施运行记录仪和数据采集传输仪等仪器、仪表，是污染防治设施的组成部分。

A、自动监控设备

B、监控中心

C、自动监控系统

D、监控软件

答案

参考答案：A

单项选择题

Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of （） . This, in turn, limits the data rate that can be carried on the transmission （） . A square wave has an infinite number of frequency components and hence an infinite （） .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the （） in this waveform is in the first few frequency components. In general, any digital waveform will have （） bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.

any digital waveform will have （） bandwidth.

A．small

B．limited

C．infinite

D．finite
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单项选择题

文化对人的影响表现在方方面面。下列表述体现文化对人的影响的是（）

A.风和日丽

B.鸟语花香

C.枯木逢春

D.乡音难改
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