垢

• Cause love itself is . . . just as innocent as roses in may
  因为爱它本身就如五月里无垢的蔷薇。
• The chimney is almost choked up with soot
  烟囱几乎被烟垢堵住了。
• Research on scale inhibitor used in oilfield
  油田用阻垢剂评价研究
• Study on the efficiency of scale inhibition action of poly maleic acid
  聚马来酸阻垢性能的研究
• Green - chemical product and phosphorus - free corrosion - inhibition
  绿色化学品与无磷阻垢缓蚀剂
• Evaluation method for special scale inhibitor of reverse osmosis
  反渗透系统专用阻垢剂的评价方法
• Scale prevention technique of oil pipeline
  原油外输管线防垢技术
• Technical condition for sodium humate used as boiler scale inhibitor
  锅炉防垢剂用腐植酸钠技术条件
• Scale removing preparation for household purpose
  家用除垢制剂
• Gas appliance sediment traps same as cga 6 . 21a
  燃气器具除垢阀