放置室外的阀门，必须盖上油毛毡或者大雨布之类防雨、防尘物品。
Placed outside the valve, must be covered with linoleum or Tarpaulins like rain, dust-proof materials.
根据油毛毡基布的生产工艺和技术指标确定涤纶短纤维的质量指标。
The quality index of PET staple fiber was defined according to production process and technical parameters of roofing felt.
根据油毛毡基布的生产工艺和技术指标确定涤纶短纤维的质量指标。
The quality index of PET staple fiber was defined according to production process and technical parameters of roofing felt.
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