国内精品视频成人一区二区,中文字幕亚洲综合,九九热视频这里只有精品

Integrally vulcanized PU blade, used to clean the non-carrying belt to prevent the ingress of foreign objects between pulley and belt. Self-gravity type fitted in with belt to ensure good scraping effect and no damage on belt. Flame-retarded and antistatic products should be selected under the working condition of underground coal mine or with coal safety requirement, which have been achieved with coal mine safety signs.