constant e常数econstantadj.不变的；经常的n.常数；恒量constant pressure point定压点constant rate of drying干燥等速constantan thermocouple康铜温差电偶constant of gravitationn.引力常数constant-load balance恒载天平constant humidity blast恒湿鼓风constant elastic alloys恒弹性合金constant angle arch dam等中心角拱坝constant volumesampling定容采样constant-volume cycle定容循环