directaxisadj.直轴directadj.直接的；笔直的；坦白的v.对准；指挥；指示；命令direct-current telegraph直流电报directed - Line of Sight对准视线链路direct frequency synthesis直接频率合成direct contact feed heater直接给水加热器direct method of isolation直接分离法direct ballistocardiograph直接记录式心冲击图机direct-view picture tube直观式显像管direct periodic strabismus直接周期性斜视direct gravimetric problem重力正演问题direct conversion receiver直接变换接收机