directional drilling 定向钻进;定向钻井;定向钻孔
directional solidification 定向凝固
directional valve
向阀;定向阀 directional control 定向控制
solenoid directional valve 电磁换向阀
directional coupler 定向耦合器
directional derivative
向导数 directional antenna 定向天![](https://dict.eudic.net/tmp/wordimg/tQWhI26lqSUQay9PuKVXT@c7vgc=.png)
directional control valve n. 定向控制阀
directional distribution
向分布 directional light 平行光;定向光源;
位灯 directional filter
向滤波器;分带网络 directional stability
向稳定性;航向保持性;航向稳定性 directional property 定向性;
向性