多根多处肋骨骨折急救要点主要是()
A.输血补液,防治休克
B.控制反常呼吸,保持呼吸道通畅
C.立即行开胸探查术
D.加压给氧
E.镇静、镇痛
参考答案:B
The scientist knew nothing about the matter, because he was always _________ himself in his study.
A.burying
B.devoting
C.focusing
D.concentrating
一定时期内,患某种疾病的人群中因本病而死亡的频率()
A.病死率
B.死亡率
C.发病率
D.患病率
E.治愈率