在两对相对性状独立遗传的实验中，F2代能稳定遗传的个体和重组型个体所占比率为( )
A：9／16和1／2
B：1／16和3／16
C：5／8和1／8
D：1/4和3／8
A
⑴Who are they? ____
⑵Where did you live?____
⑶Is this your grandpa?____
⑷Did he learn Chinese ?____
⑸What's he doing?____
B
A.Yes, it is.
B.They are my grandparents.
C.He's reading a book.
D.No,he didn't.
E.I lived in a small house.
四五二十是五的乘法口诀的第几句（ ）？
C
D
电极材料
Cu、Zn
Cu、Ag
Cu、C
Fe、Zn
电解液
FeCl3
Fe2（SO4）3
Fe（NO3）2
CuSO4
