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procedure TfmQAB.FormShortCut(var Msg: TWMKey; var Handled: Boolean);
begin
if (Msg.CharCode = 116)  and (HiWord(GetKeyState(VK_CONTROL)) = 1)  then 
  begin
    ......
  end
end;

【参考リンク】

• Catch SHIFT key during menu item selection? – Delphi Tips – CJC Delphi (Cool Delphi Tips)
• GetKeyState:GetKeyState ，該函式檢取指定虛擬鍵的 -百科知識中文網
• DELPHI OnKeyDown,OnKeyPress,OnKeyUp区别_踏雪无痕的博客-CSDN博客_delphi onkeydown
• delphi key值表 – 台部落
• How to detect ctrl-t keypress in Delphi – Stack Overflow
• 鍵盤鍵碼值對照表