A:细胞质遗传
B:常染色体显性遗传
C:X染色体隐性遗传
D:X染色体显性遗传
——Did you hear that water in Tai Lake smelled terrible?——Yes.It ___________ because of people and factories.
读“俄罗斯轮廓图”,完成下列题目.
已知a是真分数,那么a2与2a的大小关系是( )