Qab的精选

问题详情：设*P={3,log2a}，Q={a,b}，若P∩Q={0}，则P∪Q=(   )A．{3,0}                    B．{3,0,1}           C．{3,0,2}           D．{3,0,1,2}【回答】B知识点：*与函数的概念题...