—Does the young man standing there ________ the company?
—No, the company is ________ his father.
如图所示,一束光从空气斜射向水面,入射光线及法线已画出.请作出这条入射光线的反射光线和折射光线;
如图,菱形ABCD的对角线AC、BD的长分别是6cm、8cm,AE⊥BC于点E,则AE的长是( )