| 1. | After many years of hard work, the manufacturer has solved such difficult problems of hydraulic door-closing mechanism as oil leakage, environment contamination, unstable closing-speed because of the variation of the of temperature, and spring metal fatigue
经过多年不懈努力，终于攻克了液压闭门器无法解决的难题，比如：漏油、污染环境、速度随温度而变化，金属弹簧易疲劳等。 |
