There a lot of sheep over there. [ ]
A. is
B. are
C. have
D. has
答案:B
气相色谱法测定烷基汞时,如何判定检测烷基汞的色谱柱已被污染?
急性感染治疗目的不是()
A.缩短病程
B.减轻症状
C.促进炎症吸收或局限化
D.防止感染扩散或转为慢性
E.减少残疾发生