3. 膝關節 (Knee joint) 屬於下列何種關節? (A) 滑動關節 (gliding joint) (B) 鞍關節 (saddle joint) (C) 屈戍關節 (hinge joint) (D) 髁狀關節 (condylar joint) (E) 球窩關節 (ball-and-socket joint)