图中,OA、OB和OC是射到空气和玻璃界面上的入射线、反射线和折射线三条光线,则______是法线,折射角为_____度。界面的______边是玻璃。
XX';60;右
关于网球肘,叙述正确的是()。
A.网球运动员专有的疾病
B.肘部伸肌总腱肌腱病变
C.肘部屈肌总腱肌腱病变
D.肘部伸肌和屈肌总腱共同的病变
E.肘关节炎
—Wayne, you have been busy with your project, haven’t you?
—Yes. Now that it’s over, I’m going to _______ myself to the Champions League Final match on TV this Saturday.
A.treat
B.serve
C.behave
D.reward