constantadj.不变的；经常的n.常数；恒量constant pump定量泵Constantinoiu康斯坦丁诺尤constant time时间常数constant code等重码Constantinianadj.君士坦丁的constant rule定项规则Constantinide康斯坦丁尼德constant duty不变工况constant area常数区,不变面积constant drop接触电压降