A:what the man with glasses i
B:what is the man with glasse
C:who the man with glasses i
D:who is the man with glasse
两只阻值相等的电阻分别通以正弦交流电与方形交流电,它们电流的最大值相等,如图所示,则两只电阻的热功率之比是( )
Tom usually____ (进行体育运动)on the weekend.
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°