horizontal rib横肋horizontaladj.水平的；横的n.水平线；水平面horizontal tail area benefits平尾面积收益horizontal enterprise cluster横向型企业集群horizontal sedimentation tank平流沉淀池horizontal dentoalveolarfiber水平位牙槽纤维horizontal strengthened story水平加强层horizontal directional drills水平定向钻机horizontal-position welding水平位置焊接horizontal direction drilling导向钻进horizontal strengthened floor水平加强层horizontal angle of deviation水平偏向角