ph

• Characterization of sludge - determination of ph value
  污泥的特性记述. ph值的测定
• Chemical reagent - general rules for the determination of ph
  化学试剂ph值测定通则
• Reference material - ph standard solution - carbonate
  参考物质. ph标准溶液.碳酸盐
• Textiles - determination of ph of aqueous extract
  纺织品.含水萃取物中ph值的测定
• Ph marine machinery equipment co . , ltd
  欢迎光临-秦皇岛平航船舶机械设备有限公司
• Woman 1 : john has a ph . d . and jim does too
  女士1 ：约翰有博士学位，吉姆也有。
• Reference material - ph standard solution - phosphate
  参考物质. ph标准溶液.磷酸盐
• 1991 ph . d . art education university of missouri
  1991年密苏里大学，艺术教育，博士
• Fruit and vegetable juices . determination of the ph - value
  水果和蔬菜汁. ph值测定