请教EDF

eyes

EDF 您好！请教一下BK7、BK4的简单对比。见笑了。
<br>另：难道74军镜还不如劳动镜？能简单介绍一下吗？非常感谢！ <IMG border=0 SRC=http://forum.starbl.com/image/regular_smile.gif onload='javascript:if(this.width>screen.width-300)this.width=screen.width-300'> <IMG border=0 SRC=http://forum.starbl.com/image/omg_smile.gif onload='javascript:if(this.width>screen.width-300)this.width=screen.width-300'>