Using the speed ratio of longitudinal wave and transverse wave to research transformation of lithology along crosswise and water-carrying fractures, thereby service...
利用纵横波速度比研究岩性的横向变化及含水裂隙，为生产矿井所面临的现实问题服务。
2
The right-hand control twists to select the vehicle's direction and moves side-to-side to provide transverse (crosswise) movement during the hover and early-transition-to-flight phases of operation;