常見(jiàn)例句雙語(yǔ)例句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.所述電熱管間隔工作時(shí)電熱管的工作時(shí)間和非工作時(shí)間的比值小于1。ip.com 返回 unattended standby time