啪啪A片大全免费,国内熟女啪啪自拍,A片毛片免费观看啪啪首页

<th id="ukhh4"><sup id="ukhh4"></sup></th>
    <center id="ukhh4"><small id="ukhh4"></small></center>
    <code id="ukhh4"></code>
    <object id="ukhh4"></object>

    <th id="ukhh4"></th>
  1. <big id="ukhh4"><em id="ukhh4"></em></big>
  2. <code id="ukhh4"><small id="ukhh4"><optgroup id="ukhh4"></optgroup></small></code>
  3. <del id="ukhh4"><small id="ukhh4"></small></del>
  4. <big id="ukhh4"><em id="ukhh4"></em></big>

    sell 4,4'-Difluorobenzophenone

    4,4'-Difluorobenzophenone is an important pharmaceutical and chemical intermediate used as the main monomer of polyetheretherketone in aromatic thermoplastic engineering plastics.

    4,4'-Difluorobenzophenone

    Synonyms:Bis(4-fluorophenyl)-methanone

    Molecular Formula:C13H8F2O

    Molecular Weight:218.20

    CAS:345-92-6

    EINECS:206-466-3

    Melting point:106-109 oC

    Boiling point:137 oC (3 torr)

    Purity:99%

    4,4'-Difluorobenzophenone is an important pharmaceutical and chemical intermediate used as the main monomer of polyetheretherketone in aromatic thermoplastic engineering plastics.


    啪啪A片大全免费,国内熟女啪啪自拍,A片毛片免费观看啪啪首页
    <th id="ukhh4"><sup id="ukhh4"></sup></th>
      <center id="ukhh4"><small id="ukhh4"></small></center>
      <code id="ukhh4"></code>
      <object id="ukhh4"></object>

      <th id="ukhh4"></th>
    1. <big id="ukhh4"><em id="ukhh4"></em></big>
    2. <code id="ukhh4"><small id="ukhh4"><optgroup id="ukhh4"></optgroup></small></code>
    3. <del id="ukhh4"><small id="ukhh4"></small></del>
    4. <big id="ukhh4"><em id="ukhh4"></em></big>