将标本中的目的菌分离出来成为纯种的人工培养方法称为
A. 增菌培养
B. 分离培养
C. 纯培养
D. 选择培养
E. 鉴别培养
Of all the sofas I've seen so far, this one is ______.
A. the nice
B. nicest
C. most nice
D. the nicest
I can't stand ______ in queues.
A. wait
B. to wait
C. waited
D. waiting
密度梯度离心时常用的溶媒不包括
A. 蔗糖
B. 甘油
C. 氯化铯
D. Renografin肾造影剂
E. 乙醇