定影液的pH值一般控制在
A.2.0~3.0
B.4.0~6.0
C.6.5~7.0
D.7.5~8.0
E.8.5~9.0
参考答案:B
解析:最适pH值为4.6~5.0。
My friend _______ a medium build and she _______ medium height. [ ]
A. has, has
B. is, is
C. has , is
D. is, has
细胞组分离心分离的步骤包括()
A.组织细胞匀浆
B.细胞匀浆沉淀
C.分析组分
D.差速离心分离
E.细胞器纯化