have effect on 中 effect 有单复数吗?

have effect on 中 effect 有单复数吗? have an effect on 是have an effect on 还是have effect on? have effect on 和have a effect on 以及have an effect on have an effect upon与have an effect on区别 have a effect on与have a effect towards 区别 matlab中eff是什么 have effect on中effect可提前?如何提前?eg doctors have been reserching what effect stand--up and other forms of comedies have on us 中effect提前了，为什么？急用........ have an effect on怎么造句 have an effect on 的意思 用have effect on造句,五句, Have the effect on和Have an effect on有什么区别? have an ill effect on have a badly effect on 的区别 关于have的用法有一个短语have effect on词典中have用法有20多种我实在不知道have effect on中的have用的是哪种thanks have an effect have an affect on呢 have a bad effect on还是have a bad effect to have an effect in he have an effect on的区别 what children learn from their parents_themA have an important effect onB has an important effect toC have an important effect toD has an important effect on