胸壁缺损直径2cm会发生()
A.纵隔扑动
B.胸壁反常呼吸运动
C.颈静脉怒张
D.头面颈部肿胀、发绀、出血
E.三凹征
参考答案:A
I forgot _____ my textbook to school, so I had to borrow one from my friend.[ ]
A. bring
B. brought
C. bringing
D. to bring
钢包偏心底吹气有利于夹杂物排除。