采用单纯颌间结扎固定法治疗髁状突骨折时，通常的固定时间为
A．3～4周 B．4周 C．4～6周 D．10周 E．2～3周
参考答案：E
能协助清除免疫复合物的补体裂解片段是（）
A.C3a
B.C3b
C.C5a
D.iC3b
E.C3d
He tried to get someone to _______ the old worker but could find none.
A in place of B instead of C take the place of D take place
