根据惠更斯一菲涅耳原理，若已知光在某时刻的波阵面为S，则S的前方某点P的光强度决定于
题型：单项选择题
问题：
根据惠更斯一菲涅耳原理，若已知光在某时刻的波阵面为S，则S的前方某点P的光强度决定于波阵面S上所在面积元发出的子波各自传到P点的( )。
A．振动振幅之和
B．光强之和
C．振动振幅之和的平方
D．振动的相干叠加
题型：单项选择题
从方框中选择正确的句子补全对话,有两项是多余的。
A: Is basketball your favorite sport?
B: Yes, I love this game. 小题1:
A: Well. I was on a basketball team when I was in high school
B: Really? Maybe we can call for more people and have a game some day.
A: 小题2:
B: Great! 小题3:
A: Don’t worry. 小题4: I will call them and I’m sure that they will be glad to come .By the way, when and where shall we play?
B: 小题5:
A: OK. See you then.
B: See you.