A:滤液中一定有Fe2+
B:滤渣一定有Ag粉
C:滤液中一定有Ag+、Cu2+
D:滤渣一定有Fe粉
Robert had a comfortable childhood, ______ up in a pleasant house with a view of the sea.
漫画赏析
基因型为AABBCC和aabbcc的两种豌豆杂交,按自由组合规律遗传,F2中基因型和表现型的种类数以及显性纯合子的概率依次是( )
结束中国靠“洋油”过日子,实现原油和石油产品全部自给的是( )