Chinese character in menu is 1-pixel smaller than non-qt application when using classical style

All Qt4 application running in Windows XP (Simplified Chinese version) have this issue.

When using classical style with "Windows Standard", the menu font is "Tahoma 8". Tahoma font contains only Latin letters, so Windows XP uses system-default Chinese font when painting Chinese character. The default font for Chinese character is "Simsun" normally. Because Chinese character in 8 pixels is difficult to distinguish, Windows XP treat them differently. It paint English Character in 8 pixels and Chinese character in 9 pixels. But Qt4 Application use 8 pixels both incorrectly.