经验表明。载体的粒度在()目到()目之间比较理想。对于稀释剂,粒度可以在()目到()目之间。
参考答案:30;80;80;200
______ he was ill yesterday, _______ he went to school.
A.Because, so
B.but,/
C.Although, but
D.Although, /
开放性气胸急救处理首先要()
A.清创缝合术
B.胸腔闭式引流
C.用厚敷料封闭伤口
D.吸氧.输血.补液
E.胸腔穿刺