短語詞組短語critical threshold potential level 臨界閾電位水平threshold water level 閾值水位threshold signal level [電子]門限信號電平threshold value level function 閾值電平函數(shù)threshold value level 閾值電平threshold expenditure level 極限消費(fèi)水平threshold initiation level 閾值起爆水平threshold smell level 可嗅出的最小含量automatic threshold -level control 自動閾值控制 返回 threshold level