The ratio of working time to standby unattended time 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。
The ratio of working time to standby unattended time 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。
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