____Six.
____I have computer class, PE and science.
____How many classes do you have on Wednesdays?
____Is it Wednesday today?
____What do you have in the afternoon?
____Yes, it is.
相关操作
选取的试剂
A
破碎鸡血细胞
蒸馏水
B
溶解核内DNA
2mol/L NaCl溶液
C
提取杂质较少的DNA
冷却的95%的酒精
D
DNA的鉴定
双缩脲试剂
下列词语中,划线字读音全都正确的一项是( )
读《简·爱》,简·爱于罗切斯特的最终结局是什么?