busy relay 占線繼電器busy period distribution [數(shù)學]忙期分布busy period [計][通信] 忙碌期間 忙期busy oneself with nothing 無事空忙busy oneself with 忙于busy oneself to no purpose 白忙busy oneself in running about 力疾奔走busy oneself in 使忙碌；使忙于busy morning and night 夙夜匪懈busy month in business [經(jīng)濟學]旺月busy market [新聞學與傳播學]繁忙的市場地區(qū)busy line [通信] 占用線路；[計][通信] 忙線路busy life 忙碌的生活busy indicator [通信] 示忙器 占線指示器busy in 忙于…busy idle condition [電子、通信與自動控制技術(shù)]忙閑條件[計算機科學技術(shù)]忙閑條件忙閑情況忙閒情況busy hour traffic [電子、通信與自動控制技術(shù)]忙時話務量busy hour call bhc [電子、通信與自動控制技術(shù)]忙時呼叫busy hour call attempt 忙時呼叫嘗試busy hour call [電子、通信與自動控制技術(shù)]忙時呼叫[機械工程]忙時呼叫