instantaneous set瞬间变定,瞬时固定instantaneousadj.瞬间的；即刻的Instantaneous polarimetric radar瞬时极化测量雷达instantaneous self-information瞬时自信息instantaneous seismic attributes瞬时地震属性instantaneous diastolic pressure即时(瞬时)舒张压instantaneous centre of velocity瞬时速度中心instantaneous seepage flow field瞬时渗流场instantaneous neutron of nucleus核瞬发中子instantaneous direction frinding瞬时测向instantaneous frequency deviation瞬时频偏instantaneous rate of deformation瞬时形变速率