短语词组短語focal aperture spot 焦斑focal l spot 焦點;焦斑focal aperture spot diameter 焦斑直逕nominal focal spot value [特毉]焦點標稱值;焦點標稱值focal spot tracking 解釋project focal spot 投射焦點thermal focal spot 熱焦斑large focal spot 大焦點;大斑焦 返回 focal spot