Electroless nickel (copper)-phosphorus-silicon carbide (SiC)-polytetrafluoroethylene (PTFE) composite coatings were prepared by adding SiC and PTFE into electro
1 .IntrOdUction High一strength,light一weight and large一size alumimimalloy eastings are widely used in aviation,astronavigation,gUided missile and 50 on.With th
A study was carried out to determine arsenic species in seafood samples collected from Chinese sea. The information about arsenic species in samples was provide