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 （1）. This, in turn, limits the data rate that can be carried on the transmission （2）. A square wave has an infinite number of frequency components and hence an infinite （3）. However, the peak amplitude of the kth frequency component, kf, is only l/k, so most of the （4） in this waveform is in the first few frequency components. In general, any digital waveform will have（5） 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.

（1）是（）

A.frequencies

B.connections

C.diagrams

D.resources

为了对工程项目成本进行控制对劳务人员、周转材料采用整体限额分包等方法，属于成本控制措施中的（）

A.组织措施

B.技术措施

C.管理措施

D.经济措施