—Where is       eraser? I can’t find it.

—Is the blue one yours?

—No,      is yellow.

A. my; mine          B. your; mine           C. mine; mine

无线电波在传播路径上遇到反射或二次辐射，使波束产生干涉效应，使空间直射波原有的等相位面和等幅度线失真。