The drive poly - v belts with mechanical tightener are designed for a useful life of 15 - 20 , 000 operating hours V型皮带传动，带有机械张紧装置，皮带正常使用寿命达15000 - 20000小时。
2.
Fixed railway installations . equipment for overhead telecommunication and signalling lines . stay - tightener with standard eye 铁路固定设备.通讯和信号装置架空线路用器材.带标准孔的固定拉紧器
3.
After years of experimenting , lavender skin tightener , an essence made by 5 natural plants is out on shelf 历经数年研究和不断实验，由五种全天然植物精心调配而成的薰衣草紧肤露正式推向市场。
4.
Fixed railway installations . equipment for overhead telecommunication and signalling lines . stay tightener with reinforced eye 铁路固定设备.通讯和信号装置架空线路用器材.带加强孔的固定拉紧器
