SPECTabbr.单光子发射计算体层摄影（=single photon emission computed tomography）specabbr.细则；规格(=specification)abbr.投机（=speculation)abbr.特别；特别地（=special/specially)specified total head规定总压头specified contractor指定承包商spectrographic orbit摄谱轨道spectroscopic factor谱因子specified management精细化管理spectrophotoelectricadj.分光光电作用的specified rated load设计荷载,额定荷载specises compositiom物种组成spectroscopic signal分光信号spectrograph grating摄谱仪光栅