交叉韧带损伤的保守治疗可()。
A.抽吸关节内血肿加压包扎
B.石膏托固定膝关节于半屈位
C.股四头肌功能锻炼
D.药物活血化瘀,消肿止痛
E.以上都是
参考答案:E
—Are you free _____ Friday?
—I have nothing _____. [ ]
A. in, to do
B. on, to do
C. on, do
D. at, to do
半知菌都没有有性阶段.