短语词组短语diffract diffraction 衍射Diffract Facula 衍射光斑x ray diffract analysis x 射线衍射分析x -diffract 衍射differentiation index diffract 衍射diffract on efficiency 衍射效率Laser diffract torsionmeter 激光衍射扭矩传感器diffract -gage 绕射规 返回 diffract