directoty名录directadj.直接的；笔直的；坦白的v.对准；指挥；指示；命令Direct Support Fire直接支援射击Direct reduced iron直接还原铁direct data channel直接数据通道Direct relief valve直动式溢流阀direct quench aging热浴时效处理directing precision指向精度direct-on starter直接起动器direct water quench直接水淬Direct tension test直接拉伸试验direct current ring换极器振铃