directarcadj.直接电弧的directadj.直接的；笔直的；坦白的v.对准；指挥；指示；命令Direct alignment直接对准directed erosion定向侵蚀direct luminaire直接型灯具directivity gain指向性因数directing magnet控制磁铁direct connector直连式连接器direct levelling直接水准测量direct algorithm直接算法directed routing定向路由direct ownership直接所有权