The ratio of working time to standby unattendedtime of the tubular electric heating elements is less than 1 when the tubular electric heating elements work at interval.
所述电热管间隔工作时电热管的工作时间和非工作时间的比值小于1。
2
Other real-time systems use algorithms to detect suspicious behaviour, such as a group loitering near a door where entry is barred, or to spot items of luggage that seem to have been left unattended.