信號(hào)與平均值(比)[S/M] monthly mean signal to noise ratio: 月平均信號(hào)噪聲比mean of ratio: 比例中項(xiàng)mean ratio: 平均比值signal ratio: 信號(hào)比extreme and mean ratio: 黃金分割點(diǎn); 外內(nèi)比下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯