单项选择题
A.像方焦点和像方主点共轭,物方焦点和物方主点共轭B.像方焦点和无限远轴上像点共轭,物方焦点和无限远轴上物点共轭C.像方焦点和物方焦点共轭,物方焦点和像方焦点共轭D.像方焦点和无限远轴上物点共轭,物方焦点和无限远轴上像点共轭