占用空闲频段的情况用经典信号检测与估计理论的方法即可以完成检测；
For the former, the classic theory of signal detection and estimation methods can be used to solve the problem;
在测量工作中，误用经典测验理论方法估计标准参照性测验的整体信度和等级线决策信度的情况非常突出。
In criterion-referenced testing, dependability index based on generalizability theory is the correct indicator of measurement reliability.
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