________ of them likes to play basketball. [ ]
A. Each
B. Everyone
C. Every
D. Both
答案:A
含病毒标本冻存时应加入的保护剂是()
A.叠氮钠
B.二甲基亚砜
C.丁二酮
D.对氨基苯甲醛
E.硝酸甘油
汽提塔底部出液温度低的原因,处理?