常見(jiàn)例句雙語(yǔ)例句The safety valve can make the lifting fluid-pressure drive circuit of a fork lift truck or a crane obtain not only high efficiency ascending speed, but also reliable and safe descending speed.該安全閥使叉車或起重機(jī)的起陞液壓敺動(dòng)廻路既有高傚率的上陞速度，又有可靠的安全下降速度。ip.com 返回 high lift safety valve