无效: of no avail; to no avail; in ...时间: time; hour无效时间损失: dead-time loss无效时间, 多余时间: garbage time无效时间间隔请求: invalid time interval request平均故障时间,平均无效时间: mean time to failure等效时间: equivalent time生效时间: effective time失效时间: dead time; out-of-service time我效时间: lost time药效时间: effective drug duration有效时间: active session; active time; available time; availabletime; duration of validity; effective time; functioning time; operational use time; pot life; significant interval; time,effective; valid time; virtual time有效时间表: active time list转效时间: break time总有效时间: calendar time失效时间应晚于生效时间: expiration time is earlier than inspire time半数有效时间: median effective time保存有效时间: shelf life报价有效时间: duration of offer部分有效时间: partial effective time等效时间常数: equivalent time constant等效时间取样: equivalent time sampling; sampling, equivalent time等效时间系样: equivalent time sampling公告失效时间: endtime机器有效时间: machine available time