Sampling a continuous-time signal at a sampling period T to obtain a discrete-time signal
, then pass through an analog reconstruction filter with cutoff frequency , its output is a continuous time signal , then there must be （）
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Which of the following sampling methods correctly describes systematic sampling？
Which of the following sampling methods correctly describes systematic sampling？
A．A sampling method which is a type of value-weighted selection in which sample size,selection and evaluation results in a conclusion in monetary amounts．B．A sampling method which involves having a constant sampling interval, the starting point for testing is determined randomly．C．A sampling method in which the auditor selects a block of contiguous items from within the population．D．Testing items with a certain characteristiC．
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以下關(guān)于 Python 語(yǔ) 言 中注釋說(shuō)法錯(cuò)誤的是（）
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