用基于随机集的上粗相等、下粗相等来表示随机上近似算子、随机下近似算子。

The upper rough equal, the lower rough equal based on the random sets are used to express upper approximation operators and the lower approximation operators based on the random sets.

youdao

无杂散动态范围被定义为用dB表示的，接收机噪声和两个相等杂散信号的电平的差，这两个杂散信号的互调产物与接收机噪声相等。

It is defined as the difference in dB between receiver noise and the level of two equal spurious signals whose intermodulation products are equal to the receiver noise.

youdao