9. 下列有關rheumatoid arthritis 的extra-articular manifestations中，何者最為正確？ (1)Uveitis (2)cervical myelopathy (3)oral mucosa ulcer (4)Felty's syndrome (5)mechanical hand (6)rheumatoid nodule (7)inflammatory bowel diseases (8)episcleritis (A) (2)+(4)+(8) (B) (1)+(2)+(3) (C) (4)+(5)+(6) (D) (6)+(7)+(8) (E) (2)+(3)+(6)