[问答题] 试述X射线衍射原理，布拉格方程和劳厄方程的物理意义。

食品生产经营者可不对其生产经营食品的安全负责。 20世纪的中国历史告诉人们，只有（）才能救中国。 ["社会主义","资本主义","改革开放","市场经济"] 大力发展科学技术主要是（）。 ["马克思提出科学技术是生产力","邓小平科学技术是第一生产力","江泽民科学技术是先进生产力的集中体现和主要标志","胡锦涛科学技术是推动人类文明进步的革命力量"] Boggis'little secret was that she wanted to see herself the（） girl. ["twelve years old","twelve year old","twelve-year-old","twelve-years-old"] CAN通信检查，在主程序界面上观察CAN通信指示灯为（）色。 ["红","绿","白","蓝"] 试述X射线衍射原理，布拉格方程和劳厄方程的物理意义。