constantlyadv.不断地；经常地constantadj.不变的；经常的n.常数；恒量constant voltage regulation恒压调节constant-expenditure line固定支出线Constant acceleration model恒加速模型constant wall pressure ring等压环,均压环constant pressure injection定压喷射constant flux blanking plug恒流堵塞器constant-flow ventilation持续气流通气constant-potential system定压制constant-voltage charging[电] 恒压充电constant-shear viscometer恒定剪力粘度计