at a range ofætəreindʒɔv短语⁸⁴³²⁰⁺⁸ 基本例句 在…射程 The detection threshold concentration of iodine was determined by inspecting radiographic images at a range of X- ray tube voltages and input exposure levels. 结论在保证 X线图像质量前提下，降低 X射线管电压和曝光量，可以有效地减少放射性损害。 dictall