A:potatoes
B:green beans
C:carrots
某同学在做探究光的折射特点实验,如图是光从空气射入水中时的光路,实验中发现,折射光线、入射光线和法线在同一平面内,折射光线和入射光线分别位于法线的两侧,通过实验还得到如表数据:
入射角α
0°
15°
30°
45°
50°
60°
反射角β
折射角γ
11°
22.1°
35.4°
40.9°
— Who's that man in our classroom? It ________ be Mr. Brown. He is much taller.— You mean the man in white? He is an exchange student from England.
如图,抛物线y=ax2﹣2ax+c(a≠0)交x轴于A、B两点,A点坐标为(3,0),与y轴交于点C(0,4),以OC、OA为边作矩形OADC交抛物线于点G.